[Game] Render custom deck zones in the deck view

The in-game deck view now walks custom zones like the standard
boards, so cards filed under a user-created zone show up in their
zone's card pile instead of disappearing from the view.

.github/workflows/codeql.yml

@@ -40,7 +40,7 @@ jobs:
 
     steps:
     - name: "Checkout repository"
-      uses: actions/checkout@v6
+      uses: actions/checkout@v7
 
     - name: "Initialize CodeQL"
       uses: github/codeql-action/init@v4

.github/workflows/docker-release.yml

@@ -127,7 +127,7 @@ jobs:
 
     steps:
       - name: "Download digests"
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           path: ${{ runner.temp }}/digests
           pattern: digest-*

cockatrice/CMakeLists.txt

@@ -214,6 +214,7 @@ set(cockatrice_SOURCES
     src/interface/widgets/deck_editor/deck_editor_printing_selector_dock_widget.cpp
     src/interface/widgets/deck_editor/deck_list_style_proxy.cpp
     src/interface/widgets/deck_editor/deck_state_manager.cpp
+    src/interface/widgets/deck_editor/deck_zone_dialog.cpp
     src/interface/widgets/deck_editor/printing_disabled_info_widget.cpp
     src/interface/widgets/general/background_sources.cpp
     src/interface/widgets/general/display/background_plate_widget.cpp

cockatrice/src/game_graphics/deckview/deck_view.cpp

@@ -8,6 +8,7 @@
 #include <QMouseEvent>
 #include <QtMath>
 #include <algorithm>
+#include <functional>
 #include <libcockatrice/card/card_info.h>
 #include <libcockatrice/deck_list/deck_list.h>
 #include <libcockatrice/deck_list/tree/deck_list_card_node.h>
@@ -381,18 +382,25 @@ void DeckViewScene::rebuildTree()
             addItem(container);
         }
 
-        for (int j = 0; j < currentZone->size(); j++) {
-            auto *currentCard = dynamic_cast<DecklistCardNode *>(currentZone->at(j));
-            if (!currentCard) {
-                continue;
+        // Cards in custom zones nested under a board are regular board cards in-game.
+        // They are collected recursively and reported with the top-level board zone
+        // as their origin, so that sideboard plans keep working.
+        std::function<void(const InnerDecklistNode *)> addZoneCards = [&addZoneCards, container, currentZone,
+                                                                       this](const InnerDecklistNode *zone) {
+            for (int j = 0; j < zone->size(); j++) {
+                auto *currentCard = dynamic_cast<DecklistCardNode *>(zone->at(j));
+                if (currentCard) {
+                    for (int k = 0; k < currentCard->getNumber(); ++k) {
+                        auto *newCard = new DeckViewCard(container, currentCard->toCardRef(), currentZone->getName());
+                        container->addCard(newCard);
+                        emit newCardAdded(newCard);
+                    }
+                } else if (auto *innerZone = dynamic_cast<InnerDecklistNode *>(zone->at(j))) {
+                    addZoneCards(innerZone);
+                }
             }
-
-            for (int k = 0; k < currentCard->getNumber(); ++k) {
-                auto *newCard = new DeckViewCard(container, currentCard->toCardRef(), currentZone->getName());
-                container->addCard(newCard);
-                emit newCardAdded(newCard);
-            }
-        }
+        };
+        addZoneCards(currentZone);
     }
 }
 

cockatrice/src/interface/widgets/cards/card_group_display_widgets/card_group_display_widget.cpp

@@ -155,6 +155,18 @@ QWidget *CardGroupDisplayWidget::constructWidgetForIndex(QPersistentModelIndex i
 
 void CardGroupDisplayWidget::updateCardDisplays()
 {
+    // Custom zones are user-defined containers: they display their cards in the same
+    // order as the tree view, i.e. the model row order. Only criteria groups apply
+    // the visual sort criteria.
+    const bool isCustomZone = trackedIndex.data(DeckRoles::IsCustomZoneRole).toBool();
+
+    if (isCustomZone) {
+        for (int i = 0; i < deckListModel->rowCount(trackedIndex); ++i) {
+            addCardWidgets(QPersistentModelIndex(deckListModel->index(i, 0, trackedIndex)));
+        }
+        return;
+    }
+
     DeckListSortFilterProxyModel proxy;
     proxy.setSourceModel(deckListModel);
     proxy.setSortCriteria(activeSortCriteria);
@@ -174,16 +186,18 @@ void CardGroupDisplayWidget::updateCardDisplays()
         QModelIndex sourceIndex = proxy.mapToSource(proxyIndex);
 
         // 4. persist the source index
-        QPersistentModelIndex persistent(sourceIndex);
+        addCardWidgets(QPersistentModelIndex(sourceIndex));
+    }
+}
 
-        // Get the card amount
-        int cardAmount =
-            sourceIndex.sibling(sourceIndex.row(), DeckListModelColumns::CARD_AMOUNT).data(Qt::EditRole).toInt();
+void CardGroupDisplayWidget::addCardWidgets(const QPersistentModelIndex &persistent)
+{
+    // Get the card amount
+    int cardAmount = persistent.sibling(persistent.row(), DeckListModelColumns::CARD_AMOUNT).data(Qt::EditRole).toInt();
 
-        // Create multiple widgets for the card count
-        for (int copy = 0; copy < cardAmount; ++copy) {
-            addToLayout(constructWidgetForIndex(persistent));
-        }
+    // Create multiple widgets for the card count
+    for (int copy = 0; copy < cardAmount; ++copy) {
+        addToLayout(constructWidgetForIndex(persistent));
     }
 }
 

cockatrice/src/interface/widgets/cards/card_group_display_widgets/card_group_display_widget.h

@@ -35,6 +35,7 @@ public:
     void onSelectionChanged(const QItemSelection &selected, const QItemSelection &deselected);
     void refreshSelectionForIndex(const QPersistentModelIndex &persistent);
     void clearAllDisplayWidgets();
+    void addCardWidgets(const QPersistentModelIndex &persistent);
 
     DeckListModel *deckListModel;
     QItemSelectionModel *selectionModel;

cockatrice/src/interface/widgets/cards/deck_card_zone_display_widget.cpp

@@ -5,6 +5,7 @@
 #include "libcockatrice/card/database/card_database_manager.h"
 
 #include <QResizeEvent>
+#include <algorithm>
 #include <libcockatrice/models/deck_list/deck_list_model.h>
 
 DeckCardZoneDisplayWidget::DeckCardZoneDisplayWidget(QWidget *parent,
@@ -51,11 +52,6 @@ DeckCardZoneDisplayWidget::DeckCardZoneDisplayWidget(QWidget *parent,
 //                                                    User Interaction
 // =====================================================================================================================
 
-void DeckCardZoneDisplayWidget::onClick(QMouseEvent *event, const ExactCard &card)
-{
-    emit cardClicked(event, card, zoneName);
-}
-
 void DeckCardZoneDisplayWidget::onHover(const ExactCard &card)
 {
     emit cardHovered(card);
@@ -95,12 +91,18 @@ void DeckCardZoneDisplayWidget::constructAppropriateWidget(QPersistentModelIndex
     }
 
     auto categoryName = index.sibling(index.row(), DeckListModelColumns::CARD_NAME).data(Qt::EditRole).toString();
+    // Cards in a custom zone belong to that zone, not the board zone, so that
+    // increment/decrement/swap actions target the custom zone.
+    const bool isCustomZone = index.data(DeckRoles::IsCustomZoneRole).toBool();
+    const QString effectiveZoneName = isCustomZone ? categoryName : zoneName;
+    const auto routeCardClick = [this, effectiveZoneName](QMouseEvent *event, const ExactCard &card) {
+        emit cardClicked(event, card, effectiveZoneName);
+    };
     if (displayType == DisplayType::Overlap) {
         auto *displayWidget = new OverlappedCardGroupDisplayWidget(
-            cardGroupContainer, deckListModel, selectionModel, index, zoneName, categoryName, activeGroupCriteria,
-            activeSortCriteria, subBannerOpacity, cardSizeWidget);
-        connect(displayWidget, &OverlappedCardGroupDisplayWidget::cardClicked, this,
-                &DeckCardZoneDisplayWidget::onClick);
+            cardGroupContainer, deckListModel, selectionModel, index, effectiveZoneName, categoryName,
+            activeGroupCriteria, activeSortCriteria, subBannerOpacity, cardSizeWidget);
+        connect(displayWidget, &OverlappedCardGroupDisplayWidget::cardClicked, this, routeCardClick);
         connect(displayWidget, &OverlappedCardGroupDisplayWidget::cardHovered, this,
                 &DeckCardZoneDisplayWidget::onHover);
         connect(displayWidget, &CardGroupDisplayWidget::cleanupRequested, this,
@@ -111,9 +113,9 @@ void DeckCardZoneDisplayWidget::constructAppropriateWidget(QPersistentModelIndex
         indexToWidgetMap.insert(index, displayWidget);
     } else if (displayType == DisplayType::Flat) {
         auto *displayWidget = new FlatCardGroupDisplayWidget(cardGroupContainer, deckListModel, selectionModel, index,
-                                                             zoneName, categoryName, activeGroupCriteria,
+                                                             effectiveZoneName, categoryName, activeGroupCriteria,
                                                              activeSortCriteria, subBannerOpacity, cardSizeWidget);
-        connect(displayWidget, &FlatCardGroupDisplayWidget::cardClicked, this, &DeckCardZoneDisplayWidget::onClick);
+        connect(displayWidget, &FlatCardGroupDisplayWidget::cardClicked, this, routeCardClick);
         connect(displayWidget, &FlatCardGroupDisplayWidget::cardHovered, this, &DeckCardZoneDisplayWidget::onHover);
         connect(displayWidget, &CardGroupDisplayWidget::cleanupRequested, this,
                 &DeckCardZoneDisplayWidget::cleanupInvalidCardGroup);
@@ -126,24 +128,22 @@ void DeckCardZoneDisplayWidget::constructAppropriateWidget(QPersistentModelIndex
 
 void DeckCardZoneDisplayWidget::displayCards()
 {
-    QSortFilterProxyModel proxy;
-    proxy.setSourceModel(deckListModel);
-    proxy.setSortRole(Qt::EditRole);
-    proxy.sort(DeckListModelColumns::CARD_NAME, Qt::AscendingOrder);
+    if (!trackedIndex.isValid()) {
+        return;
+    }
 
-    // 1. trackedIndex is a source index → map it to proxy space
-    QModelIndex proxyParent = proxy.mapFromSource(trackedIndex);
+    // Iterate the direct children of the tracked zone, keeping the tree view's row
+    // order (criteria groups first, then custom zones in their creation order).
+    QList<QPersistentModelIndex> rows;
+    for (int i = 0; i < deckListModel->rowCount(trackedIndex); ++i) {
+        rows.append(QPersistentModelIndex(deckListModel->index(i, 0, trackedIndex)));
+    }
 
-    // 2. iterate children under the proxy parent
-    for (int i = 0; i < proxy.rowCount(proxyParent); ++i) {
-        QModelIndex proxyIndex = proxy.index(i, 0, proxyParent);
-
-        // 3. map back to source
-        QModelIndex sourceIndex = proxy.mapToSource(proxyIndex);
-
-        // 4. persist the source index
-        QPersistentModelIndex persistent(sourceIndex);
+    std::stable_partition(rows.begin(), rows.end(), [](const QPersistentModelIndex &row) {
+        return !row.data(DeckRoles::IsCustomZoneRole).toBool();
+    });
 
+    for (const QPersistentModelIndex &persistent : rows) {
         constructAppropriateWidget(persistent);
     }
 }

cockatrice/src/interface/widgets/cards/deck_card_zone_display_widget.h

@@ -42,7 +42,6 @@ public:
     void addCardsToOverlapWidget();
 
 public slots:
-    void onClick(QMouseEvent *event, const ExactCard &card);
     void onHover(const ExactCard &card);
     void cleanupInvalidCardGroup(CardGroupDisplayWidget *displayWidget);
     void constructAppropriateWidget(QPersistentModelIndex index);

cockatrice/src/interface/widgets/deck_editor/card_database_view.cpp

@@ -90,6 +90,13 @@ void CardDatabaseView::decrementCard(const QString &zoneName)
     emit cardDecremented(currentCardName(), zoneName);
 }
 
+void CardDatabaseView::setZoneMenuProvider(const std::function<QList<QPair<QString, QStringList>>()> &provider,
+                                           const std::function<void()> &newZoneHandler)
+{
+    zoneMenuProvider = provider;
+    this->newZoneHandler = newZoneHandler;
+}
+
 void CardDatabaseView::updateCard(const QModelIndex &current, const QModelIndex & /*previous*/)
 {
     if (!current.isValid()) {
@@ -142,6 +149,39 @@ void CardDatabaseView::openCustomMenu(QPoint point)
             [this, card] { emit cardAdded(card->getName(), DECK_ZONE_SIDE); });
     connect(selectPrinting, &QAction::triggered, this, &CardDatabaseView::selectPrintingClicked);
 
+    if (zoneMenuProvider) {
+        QMenu *addToZoneMenu = menu.addMenu(tr("Add to Zone"));
+        for (const QString &boardName : InnerDecklistNode::boardZoneNames()) {
+            QAction *action = addToZoneMenu->addAction(InnerDecklistNode::visibleNameFromName(boardName));
+            connect(action, &QAction::triggered, this,
+                    [this, card, boardName] { emit cardAdded(card->getName(), boardName); });
+        }
+
+        bool anyCustomZone = false;
+        const auto zoneBoards = zoneMenuProvider();
+        for (const auto &zoneBoard : zoneBoards) {
+            const QString &boardName = zoneBoard.first;
+            const QStringList &customZones = zoneBoard.second;
+            if (customZones.isEmpty()) {
+                continue;
+            }
+            anyCustomZone = true;
+            QMenu *boardSubmenu = addToZoneMenu->addMenu(InnerDecklistNode::visibleNameFromName(boardName));
+            for (const QString &zoneName : customZones) {
+                QAction *action = boardSubmenu->addAction(zoneName);
+                connect(action, &QAction::triggered, this,
+                        [this, card, zoneName] { emit cardAdded(card->getName(), zoneName); });
+            }
+        }
+
+        if (anyCustomZone) {
+            addToZoneMenu->addSeparator();
+        }
+
+        QAction *newZoneAction = addToZoneMenu->addAction(tr("Create &new zone..."));
+        connect(newZoneAction, &QAction::triggered, this, [this] { newZoneHandler(); });
+    }
+
     if (canBeCommander(*card)) {
         QAction *edhRecCommander = menu.addAction(tr("Show on EDHRec (Commander)"));
         connect(edhRecCommander, &QAction::triggered, this, [this, card] { emit edhrecClicked(card, true); });

cockatrice/src/interface/widgets/deck_editor/card_database_view.h

@@ -4,6 +4,7 @@
 #include "../../key_signals.h"
 
 #include <QTreeView>
+#include <functional>
 #include <libcockatrice/card/card_info.h>
 
 class CardDatabaseModel;
@@ -19,6 +20,12 @@ class CardDatabaseView : public QTreeView
     KeySignals searchKeySignals;
     CardDatabaseDisplayModel *databaseDisplayModel;
 
+    /// Provides the custom zones available in the current deck, grouped by board zone.
+    /// The list contains (board zone name, custom zone names) pairs for every board.
+    std::function<QList<QPair<QString, QStringList>>()> zoneMenuProvider;
+    /// Handler invoked when the user picks "New zone..." from the add-to-zone menu.
+    std::function<void()> newZoneHandler;
+
 public:
     explicit CardDatabaseView(QWidget *parent, CardDatabaseDisplayModel *model);
 
@@ -33,6 +40,16 @@ public:
         return &searchKeySignals;
     }
 
+    /**
+     * @brief Sets the provider used to populate the "Add to zone" submenu of the context menu.
+     * If no provider is set, the submenu is not shown.
+     *
+     * @param provider Returns the custom zones of the current deck, grouped by board zone
+     * @param newZoneHandler Invoked when the user chooses "New zone..." in the submenu
+     */
+    void setZoneMenuProvider(const std::function<QList<QPair<QString, QStringList>>()> &provider,
+                             const std::function<void()> &newZoneHandler);
+
 signals:
     void cardChanged(const QString &cardName);
 

cockatrice/src/interface/widgets/deck_editor/deck_editor_card_database_dock_widget.cpp

@@ -1,5 +1,12 @@
 #include "deck_editor_card_database_dock_widget.h"
 
+#include "../../../interface/widgets/tabs/abstract_tab_deck_editor.h"
+#include "card_database_view.h"
+#include "deck_state_manager.h"
+#include "deck_zone_dialog.h"
+
+#include <libcockatrice/deck_list/deck_list_node_tree.h>
+
 DeckEditorCardDatabaseDockWidget::DeckEditorCardDatabaseDockWidget(AbstractTabDeckEditor *parent) : QDockWidget(parent)
 {
     setObjectName("databaseDisplayDock");
@@ -15,6 +22,26 @@ void DeckEditorCardDatabaseDockWidget::createDatabaseDisplayDock(AbstractTabDeck
 {
     databaseDisplayWidget = new DeckEditorDatabaseDisplayWidget(this, deckEditor->databaseModel);
 
+    databaseDisplayWidget->getDatabaseView()->setZoneMenuProvider(
+        [deckEditor]() -> QList<QPair<QString, QStringList>> {
+            QList<QPair<QString, QStringList>> result;
+            auto *deckListModel = deckEditor->deckStateManager->getModel();
+            for (const QString &boardName : InnerDecklistNode::boardZoneNames()) {
+                result.append({boardName, deckListModel->getCustomZoneNames(boardName)});
+            }
+            return result;
+        },
+        [this, deckEditor] {
+            QString boardName;
+            const QString zoneName =
+                DeckZoneDialog::promptForNewZone(this, {}, &boardName, [deckEditor](const QString &candidate) {
+                    return deckEditor->deckStateManager->validateNewZoneName(candidate);
+                });
+            if (!zoneName.isEmpty()) {
+                deckEditor->deckStateManager->createCustomZone(boardName, zoneName);
+            }
+        });
+
     auto *frame = new QVBoxLayout;
     frame->setObjectName("databaseDisplayFrame");
     frame->addWidget(databaseDisplayWidget);

cockatrice/src/interface/widgets/deck_editor/deck_editor_deck_dock_widget.cpp

@@ -7,15 +7,18 @@
 #include "../tabs/api/commander_spellbook/commander_bracket_widget.h"
 #include "deck_list_style_proxy.h"
 #include "deck_state_manager.h"
+#include "deck_zone_dialog.h"
 
 #include <QComboBox>
 #include <QDockWidget>
 #include <QHeaderView>
 #include <QLabel>
+#include <QMessageBox>
 #include <QPushButton>
 #include <QSplitter>
 #include <QTextEdit>
 #include <libcockatrice/card/database/card_database_manager.h>
+#include <libcockatrice/deck_list/deck_list_node_tree.h>
 #include <libcockatrice/settings/deck_editor_settings.h>
 #include <libcockatrice/settings/interface_settings.h>
 #include <libcockatrice/utility/macros.h>
@@ -772,14 +775,143 @@ void DeckEditorDeckDockWidget::offsetCountAtIndex(const QModelIndex &idx, bool i
 
 void DeckEditorDeckDockWidget::decklistCustomMenu(QPoint point)
 {
+    const QModelIndex sourceIndex = proxy->mapToSource(deckView->indexAt(point));
+
     QMenu menu;
 
+    const bool isCustomZoneRow = sourceIndex.isValid() && sourceIndex.data(DeckRoles::IsCustomZoneRole).toBool();
+    const bool isBoardZoneRow = sourceIndex.isValid() && !isCustomZoneRow && !sourceIndex.parent().isValid();
+    const bool isCardRow =
+        sourceIndex.isValid() && !isCustomZoneRow && !isBoardZoneRow && !getModel()->hasChildren(sourceIndex);
+
+    if (isCardRow) {
+        addMoveToZoneMenu(&menu, sourceIndex);
+        menu.addSeparator();
+    } else if (isCustomZoneRow) {
+        const QString zoneName =
+            sourceIndex.siblingAtColumn(DeckListModelColumns::CARD_NAME).data(Qt::EditRole).toString();
+
+        QAction *renameAction = menu.addAction(tr("&Rename zone..."));
+        connect(renameAction, &QAction::triggered, this, [this, zoneName] {
+            const QString newName = DeckZoneDialog::promptForRename(this, zoneName, [this](const QString &candidate) {
+                return deckStateManager->validateNewZoneName(candidate);
+            });
+            if (!newName.isEmpty() && newName != zoneName) {
+                deckStateManager->renameCustomZone(zoneName, newName);
+            }
+        });
+
+        QMenu *boardMenu = menu.addMenu(tr("Change &board"));
+        addChangeBoardMenu(boardMenu, zoneName);
+
+        QAction *deleteAction = menu.addAction(tr("&Delete zone"));
+        deleteAction->setEnabled(!getModel()->hasChildren(sourceIndex));
+        deleteAction->setStatusTip(tr("Move or remove all cards first."));
+        connect(deleteAction, &QAction::triggered, this, [this, zoneName] {
+            const auto result =
+                QMessageBox::warning(this, tr("Delete zone"), tr("Delete the zone \"%1\"?").arg(zoneName),
+                                     QMessageBox::Yes | QMessageBox::No, QMessageBox::No);
+            if (result == QMessageBox::Yes) {
+                deckStateManager->removeCustomZone(zoneName);
+            }
+        });
+        menu.addSeparator();
+    } else if (isBoardZoneRow) {
+        const QString boardName =
+            sourceIndex.siblingAtColumn(DeckListModelColumns::CARD_NAME).data(Qt::EditRole).toString();
+        // Tokens cannot host custom zones, so only offer the action on real boards.
+        const bool canHostCustomZones =
+            boardName == DECK_ZONE_MAIN || boardName == DECK_ZONE_SIDE || boardName == DECK_ZONE_MAYBEBOARD;
+        if (canHostCustomZones) {
+            addNewZoneAction(&menu, boardName);
+            menu.addSeparator();
+        }
+    } else if (!sourceIndex.isValid()) {
+        addNewZoneAction(&menu);
+        menu.addSeparator();
+    }
+
     QAction *selectPrinting = menu.addAction(tr("Select Printing"));
     connect(selectPrinting, &QAction::triggered, deckEditor, &AbstractTabDeckEditor::showPrintingSelector);
 
     menu.exec(deckView->mapToGlobal(point));
 }
 
+void DeckEditorDeckDockWidget::addMoveToZoneMenu(QMenu *menu, const QModelIndex &sourceCardIndex)
+{
+    const auto moveToZone = [this, sourceCardIndex](const QString &targetZoneName) {
+        deckStateManager->moveCardToZone(sourceCardIndex, targetZoneName);
+    };
+
+    for (const QString &boardName : InnerDecklistNode::boardZoneNames()) {
+        QAction *action = menu->addAction(InnerDecklistNode::visibleNameFromName(boardName));
+        connect(action, &QAction::triggered, this, [moveToZone, boardName] { moveToZone(boardName); });
+    }
+
+    const auto tree = deckStateManager->getDeckListShared()->getTree();
+    bool anyCustomZone = false;
+    for (const QString &boardName : InnerDecklistNode::boardZoneNames()) {
+        QList<const InnerDecklistNode *> customZones = tree->getCustomZones(boardName);
+        if (customZones.isEmpty()) {
+            continue;
+        }
+        anyCustomZone = true;
+        QMenu *boardSubmenu = menu->addMenu(InnerDecklistNode::visibleNameFromName(boardName));
+        for (const auto *customZone : customZones) {
+            QAction *action = boardSubmenu->addAction(customZone->getName());
+            connect(action, &QAction::triggered, this, [moveToZone, customZone] { moveToZone(customZone->getName()); });
+        }
+    }
+
+    if (anyCustomZone) {
+        menu->addSeparator();
+    }
+
+    addNewZoneAction(menu);
+}
+
+void DeckEditorDeckDockWidget::addChangeBoardMenu(QMenu *menu, const QString &zoneName)
+{
+    const auto tree = deckStateManager->getDeckListShared()->getTree();
+    for (const QString &boardName : InnerDecklistNode::boardZoneNames()) {
+        QAction *action = menu->addAction(InnerDecklistNode::visibleNameFromName(boardName));
+
+        // The board currently holding the zone is marked instead of offered.
+        // Duplicate names cannot come up through the editor, so this doubles as
+        // the uniqueness guard for imported decks.
+        bool holdsTheZone = false;
+        for (const auto *customZone : tree->getCustomZones(boardName)) {
+            if (customZone->getName() == zoneName) {
+                holdsTheZone = true;
+                break;
+            }
+        }
+        if (holdsTheZone) {
+            action->setCheckable(true);
+            action->setChecked(true);
+            continue;
+        }
+
+        connect(action, &QAction::triggered, this,
+                [this, zoneName, boardName] { deckStateManager->moveCustomZone(zoneName, boardName); });
+    }
+}
+
+void DeckEditorDeckDockWidget::addNewZoneAction(QMenu *menu, const QString &initialBoardName)
+{
+    QAction *newZoneAction = menu->addAction(tr("Create &new zone..."));
+    connect(newZoneAction, &QAction::triggered, this, [this, initialBoardName] {
+        QString boardName;
+        const QString zoneName =
+            DeckZoneDialog::promptForNewZone(this, initialBoardName, &boardName, [this](const QString &candidate) {
+                return deckStateManager->validateNewZoneName(candidate);
+            });
+        if (!zoneName.isEmpty()) {
+            deckStateManager->createCustomZone(boardName, zoneName);
+        }
+    });
+}
+
 void DeckEditorDeckDockWidget::refreshShortcuts()
 {
     ShortcutsSettings &shortcuts = SettingsCache::instance().shortcuts();

cockatrice/src/interface/widgets/deck_editor/deck_editor_deck_dock_widget.h

@@ -19,6 +19,7 @@
 #include <QComboBox>
 #include <QDockWidget>
 #include <QLabel>
+#include <QMenu>
 #include <QPushButton>
 #include <QTextEdit>
 #include <QTreeView>
@@ -102,6 +103,10 @@ private:
     [[nodiscard]] QModelIndexList getSelectedCardNodeSourceIndices() const;
     void offsetCountAtIndex(const QModelIndex &idx, bool isIncrement);
 
+    void addMoveToZoneMenu(QMenu *menu, const QModelIndex &sourceCardIndex);
+    void addChangeBoardMenu(QMenu *menu, const QString &zoneName);
+    void addNewZoneAction(QMenu *menu, const QString &initialBoardName = {});
+
 private slots:
     void decklistCustomMenu(QPoint point);
     void updateCard(QModelIndex, const QModelIndex &current);

cockatrice/src/interface/widgets/deck_editor/deck_state_manager.cpp

@@ -2,6 +2,7 @@
 
 #include <libcockatrice/card/database/card_database_manager.h>
 #include <libcockatrice/deck_list/deck_list_history_manager.h>
+#include <libcockatrice/deck_list/tree/inner_deck_list_node.h>
 
 DeckStateManager::DeckStateManager(QObject *parent)
     : QObject(parent), deckList(QSharedPointer<DeckList>(new DeckList)),
@@ -307,6 +308,187 @@ bool DeckStateManager::decrementCountAtIndex(const QModelIndex &idx)
     return offsetCountAtIndex(idx, -1);
 }
 
+bool DeckStateManager::moveCardToZone(const QModelIndex &idx, const QString &targetZoneName)
+{
+    if (!idx.isValid()) {
+        return false;
+    }
+
+    // Only actual card rows can be moved. Group or zone rows report an
+    // aggregate amount and must never be deleted by this operation.
+    if (!idx.data(DeckRoles::IsCardRole).toBool()) {
+        return false;
+    }
+
+    QString cardName = idx.siblingAtColumn(DeckListModelColumns::CARD_NAME).data(Qt::EditRole).toString();
+    QString providerId = idx.siblingAtColumn(DeckListModelColumns::CARD_PROVIDER_ID).data(Qt::DisplayRole).toString();
+    int copies = idx.siblingAtColumn(DeckListModelColumns::CARD_AMOUNT).data(Qt::EditRole).toInt();
+
+    if (copies <= 0) {
+        return false;
+    }
+
+    // Tokens only live in the tokens zone and cannot be moved into decks.
+    CardInfoPtr info = CardDatabaseManager::query()->getCardInfo(cardName);
+    if (info && info->getIsToken()) {
+        return false;
+    }
+
+    // Determine the zone the card currently lives in: the enclosing custom
+    // zone, or the nearest top-level zone (board zone or legacy zone).
+    QString currentZoneName;
+    for (QModelIndex ancestor = idx.parent(); ancestor.isValid(); ancestor = ancestor.parent()) {
+        bool isCustomZone = ancestor.data(DeckRoles::IsCustomZoneRole).toBool();
+        if (isCustomZone || !ancestor.parent().isValid()) {
+            currentZoneName = ancestor.siblingAtColumn(DeckListModelColumns::CARD_NAME).data(Qt::EditRole).toString();
+            break;
+        }
+    }
+
+    if (currentZoneName == targetZoneName) {
+        return false;
+    }
+
+    QString reason = tr("Moved %1 × \"%2\" (%3) to %4")
+                         .arg(copies)
+                         .arg(cardName)
+                         .arg(providerId)
+                         .arg(InnerDecklistNode::visibleNameFromName(targetZoneName));
+
+    return modifyDeck(reason, [&idx, &cardName, &providerId, &targetZoneName, copies](auto model) {
+        if (!model->removeRow(idx.row(), idx.parent())) {
+            return false;
+        }
+
+        if (ExactCard card = CardDatabaseManager::query()->getCard({cardName, providerId})) {
+            for (int i = 0; i < copies; ++i) {
+                model->addCard(card, targetZoneName);
+            }
+        } else {
+            for (int i = 0; i < copies; ++i) {
+                model->addPreferredPrintingCard(cardName, targetZoneName, true);
+            }
+        }
+
+        return true;
+    });
+}
+
+bool DeckStateManager::createCustomZone(const QString &boardZoneName, const QString &zoneName)
+{
+    const QString trimmedZoneName = zoneName.trimmed();
+    if (trimmedZoneName.isEmpty()) {
+        return false;
+    }
+
+    QString reason =
+        tr("Created zone \"%1\" in %2").arg(trimmedZoneName, InnerDecklistNode::visibleNameFromName(boardZoneName));
+
+    return modifyTree(reason, [&boardZoneName, &trimmedZoneName](DecklistNodeTree *tree) {
+        return tree->addCustomZone(boardZoneName, trimmedZoneName) != nullptr;
+    });
+}
+
+bool DeckStateManager::renameCustomZone(const QString &oldZoneName, const QString &newZoneName)
+{
+    const QString trimmedNewZoneName = newZoneName.trimmed();
+    if (trimmedNewZoneName.isEmpty() || oldZoneName == trimmedNewZoneName) {
+        return false;
+    }
+
+    QString reason = tr("Renamed zone \"%1\" to \"%2\"").arg(oldZoneName, trimmedNewZoneName);
+
+    return modifyTree(reason, [&oldZoneName, &trimmedNewZoneName](DecklistNodeTree *tree) {
+        return tree->renameCustomZone(oldZoneName, trimmedNewZoneName);
+    });
+}
+
+bool DeckStateManager::moveCustomZone(const QString &zoneName, const QString &newBoardZoneName)
+{
+    const auto *tree = deckList->getTree();
+
+    // Locate the board currently holding the zone.
+    QString currentBoardName;
+    for (const QString &boardName : InnerDecklistNode::boardZoneNames()) {
+        for (const auto *zone : tree->getCustomZones(boardName)) {
+            if (zone->getName() == zoneName) {
+                currentBoardName = boardName;
+                break;
+            }
+        }
+        if (!currentBoardName.isEmpty()) {
+            break;
+        }
+    }
+
+    if (currentBoardName.isEmpty()) {
+        return false;
+    }
+
+    // Same-board moves are no-ops and must not pollute the history.
+    if (currentBoardName == newBoardZoneName) {
+        return true;
+    }
+
+    // Zone names are deck-unique among zones created through this manager, so a
+    // same-named zone on the target board can only come from an imported deck.
+    // Refuse the move instead of silently stacking same-named zones.
+    for (const auto *zone : tree->getCustomZones(newBoardZoneName)) {
+        if (zone->getName() == zoneName) {
+            return false;
+        }
+    }
+
+    QString reason =
+        tr("Moved zone \"%1\" to %2").arg(zoneName, InnerDecklistNode::visibleNameFromName(newBoardZoneName));
+
+    return modifyTree(reason, [&zoneName, &newBoardZoneName](DecklistNodeTree *tree) {
+        return tree->moveCustomZone(zoneName, newBoardZoneName);
+    });
+}
+
+bool DeckStateManager::removeCustomZone(const QString &zoneName)
+{
+    QString reason = tr("Deleted zone \"%1\"").arg(zoneName);
+
+    return modifyTree(reason, [&zoneName](DecklistNodeTree *tree) { return tree->removeCustomZone(zoneName); });
+}
+
+QString DeckStateManager::validateNewZoneName(const QString &zoneName) const
+{
+    if (zoneName.trimmed().isEmpty()) {
+        return tr("Enter a zone name.");
+    }
+
+    const QString trimmedZoneName = zoneName.trimmed();
+
+    // The standard zone names are reserved even before they exist.
+    if (trimmedZoneName == DECK_ZONE_MAIN || trimmedZoneName == DECK_ZONE_SIDE ||
+        trimmedZoneName == DECK_ZONE_MAYBEBOARD || trimmedZoneName == DECK_ZONE_TOKENS) {
+        return tr("This name is reserved.");
+    }
+
+    const auto *tree = deckList->getTree();
+
+    // Top-level zones (boards and legacy zones) claim their names too.
+    for (int i = 0; i < tree->getRoot()->size(); i++) {
+        if (tree->getRoot()->at(i)->getName() == trimmedZoneName) {
+            return tr("A zone with this name already exists.");
+        }
+    }
+
+    // Custom zone names are unique across the whole deck.
+    for (const QString &board : InnerDecklistNode::boardZoneNames()) {
+        for (const auto *customZone : tree->getCustomZones(board)) {
+            if (customZone->getName() == trimmedZoneName) {
+                return tr("A zone with this name already exists.");
+            }
+        }
+    }
+
+    return {};
+}
+
 bool DeckStateManager::offsetCountAtIndex(const QModelIndex &idx, int offset)
 {
     if (!idx.isValid()) {
@@ -367,6 +549,21 @@ void DeckStateManager::requestHistorySave(const QString &reason)
     historyManager->save(deckList->createMemento(reason));
 }
 
+bool DeckStateManager::modifyTree(const QString &reason, const std::function<bool(DecklistNodeTree *)> &operation)
+{
+    DeckListMemento memento = deckList->createMemento(reason);
+    bool success = operation(deckList->getTree());
+
+    if (success) {
+        historyManager->save(memento);
+        deckListModel->rebuildTree();
+        deckList->refreshDeckHash();
+        doCardModified();
+    }
+
+    return success;
+}
+
 /**
  * @brief Handles updating state and emitting signals whenever the cards are modified
  */

cockatrice/src/interface/widgets/deck_editor/deck_state_manager.h

@@ -5,6 +5,7 @@
 #include "deck_list_model.h"
 
 #include <QSharedPointer>
+#include <functional>
 #include <libcockatrice/deck_list/deck_list.h>
 
 class DeckListHistoryManager;
@@ -236,6 +237,68 @@ public:
      */
     bool decrementCountAtIndex(const QModelIndex &idx);
 
+    /**
+     * @brief Moves all copies of the card at the given index to the given zone.
+     * No-ops if the index is invalid, not a card node, the card is a token, or the
+     * card is already in the target zone.
+     * Saves the operation to history if successful.
+     *
+     * @param idx The model index of the card to move
+     * @param targetZoneName The zone to move the card to (board zone or custom zone name)
+     * @return Whether the operation was successfully performed
+     */
+    bool moveCardToZone(const QModelIndex &idx, const QString &targetZoneName);
+
+    /**
+     * @brief Creates a new custom zone nested under a board zone.
+     * Saves the operation to history if successful.
+     *
+     * @param boardZoneName The board zone to nest the custom zone under
+     * @param zoneName The name of the new custom zone. Gets trimmed and must be
+     *        unique across the deck.
+     * @return Whether the zone was created
+     */
+    bool createCustomZone(const QString &boardZoneName, const QString &zoneName);
+
+    /**
+     * @brief Renames a custom zone.
+     * Saves the operation to history if successful.
+     *
+     * @param oldZoneName The current name of the custom zone
+     * @param newZoneName The new name. Gets trimmed and must be unique across the deck.
+     * @return Whether the rename succeeded
+     */
+    bool renameCustomZone(const QString &oldZoneName, const QString &newZoneName);
+
+    /**
+     * @brief Moves a custom zone (and its cards) to a different board zone.
+     * Same-board moves succeed without creating a history entry.
+     * Saves the operation to history if successful.
+     *
+     * @param zoneName The custom zone to move
+     * @param newBoardZoneName The board zone to move the custom zone under
+     * @return Whether the move succeeded
+     */
+    bool moveCustomZone(const QString &zoneName, const QString &newBoardZoneName);
+
+    /**
+     * @brief Removes a custom zone and all its cards.
+     * Saves the operation to history if successful.
+     *
+     * @param zoneName The custom zone to remove
+     * @return Whether the zone was removed
+     */
+    bool removeCustomZone(const QString &zoneName);
+
+    /**
+     * @brief Checks whether a candidate name is usable for a new custom zone.
+     *
+     * @param zoneName The candidate name
+     * @return An empty string when the name is usable, otherwise a user-facing
+     *         error message describing the problem
+     */
+    [[nodiscard]] QString validateNewZoneName(const QString &zoneName) const;
+
     /**
      * Undoes n steps of the history, setting the decklist state and updating the current step in the historyManager.
      * @param steps Number of steps to undo.
@@ -257,6 +320,7 @@ public slots:
 
 private:
     bool offsetCountAtIndex(const QModelIndex &idx, int offset);
+    bool modifyTree(const QString &reason, const std::function<bool(DecklistNodeTree *)> &operation);
     void doCardModified();
     void doMetadataModified();
 

cockatrice/src/interface/widgets/deck_editor/deck_zone_dialog.cpp

@@ -0,0 +1,142 @@
+#include "deck_zone_dialog.h"
+
+#include <QComboBox>
+#include <QDialogButtonBox>
+#include <QLabel>
+#include <QLineEdit>
+#include <QPushButton>
+#include <QVBoxLayout>
+#include <libcockatrice/deck_list/tree/inner_deck_list_node.h>
+#include <libcockatrice/utility/string_limits.h>
+
+DeckZoneDialog::DeckZoneDialog(QWidget *parent,
+                               const QString &initialBoardName,
+                               const std::function<QString(const QString &)> &_nameValidator,
+                               bool _allowBoardSelection)
+    : QDialog(parent), nameValidator(_nameValidator), allowBoardSelection(_allowBoardSelection)
+{
+    nameLabel = new QLabel(this);
+    nameEdit = new QLineEdit(this);
+    nameEdit->setMaxLength(MAX_NAME_LENGTH);
+
+    errorLabel = new QLabel(this);
+    errorLabel->hide();
+
+    boardLabel = new QLabel(this);
+    boardCombo = new QComboBox(this);
+    for (const QString &boardName : InnerDecklistNode::boardZoneNames()) {
+        // Use the icon overload explicitly so `boardName` lands in the user data role
+        // (visible text is applied below in retranslateUi). The two-argument form
+        // addItem({}, boardName) would be ambiguous and resolve to the icon overload
+        // with empty user data, yielding empty entries and an empty getBoardName().
+        boardCombo->addItem({}, {}, boardName);
+    }
+    if (!initialBoardName.isEmpty()) {
+        int idx = boardCombo->findData(initialBoardName);
+        if (idx != -1) {
+            boardCombo->setCurrentIndex(idx);
+        }
+    }
+
+    buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel, this);
+    buttonBox->button(QDialogButtonBox::Ok)->setEnabled(false);
+    connect(buttonBox, &QDialogButtonBox::accepted, this, &QDialog::accept);
+    connect(buttonBox, &QDialogButtonBox::rejected, this, &QDialog::reject);
+
+    auto *layout = new QVBoxLayout(this);
+    layout->addWidget(nameLabel);
+    layout->addWidget(nameEdit);
+    layout->addWidget(errorLabel);
+    if (allowBoardSelection) {
+        layout->addWidget(boardLabel);
+        layout->addWidget(boardCombo);
+    }
+    layout->addWidget(buttonBox);
+
+    retranslateUi();
+
+    connect(nameEdit, &QLineEdit::textChanged, this, [this] { validateName(); });
+    validateName();
+
+    nameEdit->setFocus();
+}
+
+QString DeckZoneDialog::getZoneName() const
+{
+    return nameEdit->text().trimmed();
+}
+
+QString DeckZoneDialog::getBoardName() const
+{
+    return boardCombo->currentData().toString();
+}
+
+void DeckZoneDialog::setZoneName(const QString &zoneName)
+{
+    nameEdit->setText(zoneName);
+    nameEdit->selectAll();
+}
+
+void DeckZoneDialog::changeEvent(QEvent *event)
+{
+    QDialog::changeEvent(event);
+
+    if (event->type() == QEvent::LanguageChange) {
+        retranslateUi();
+    }
+}
+
+void DeckZoneDialog::retranslateUi()
+{
+    setWindowTitle(allowBoardSelection ? tr("New zone") : tr("Rename zone"));
+
+    nameLabel->setText(tr("Zone &name:"));
+    nameLabel->setBuddy(nameEdit);
+
+    boardLabel->setText(tr("&Parent zone:"));
+    boardLabel->setBuddy(boardCombo);
+
+    for (int i = 0; i < boardCombo->count(); i++) {
+        boardCombo->setItemText(i, InnerDecklistNode::visibleNameFromName(boardCombo->itemData(i).toString()));
+    }
+}
+
+void DeckZoneDialog::validateName()
+{
+    const QString zoneName = nameEdit->text().trimmed();
+    QString error;
+    if (zoneName.isEmpty()) {
+        error = tr("Enter a zone name.");
+    } else if (nameValidator) {
+        error = nameValidator(zoneName);
+    }
+
+    errorLabel->setText(error);
+    errorLabel->setVisible(!error.isEmpty());
+    buttonBox->button(QDialogButtonBox::Ok)->setEnabled(error.isEmpty());
+}
+
+QString DeckZoneDialog::promptForNewZone(QWidget *parent,
+                                         const QString &initialBoardName,
+                                         QString *chosenBoardName,
+                                         const std::function<QString(const QString &)> &nameValidator)
+{
+    DeckZoneDialog dialog(parent, initialBoardName, nameValidator);
+    if (dialog.exec() != QDialog::Accepted) {
+        return {};
+    }
+
+    if (chosenBoardName) {
+        *chosenBoardName = dialog.getBoardName();
+    }
+    return dialog.getZoneName();
+}
+
+QString DeckZoneDialog::promptForRename(QWidget *parent,
+                                        const QString &currentZoneName,
+                                        const std::function<QString(const QString &)> &nameValidator)
+{
+    DeckZoneDialog dialog(parent, {}, nameValidator, false);
+    dialog.setZoneName(currentZoneName);
+    return dialog.exec() == QDialog::Accepted ? dialog.getZoneName() : QString();
+}

cockatrice/src/interface/widgets/deck_editor/deck_zone_dialog.h

@@ -0,0 +1,123 @@
+/**
+ * @file deck_zone_dialog.h
+ * @ingroup DeckEditorWidgets
+ * @brief Shared dialog for creating custom deck zones.
+ */
+
+#ifndef DECK_ZONE_DIALOG_H
+#define DECK_ZONE_DIALOG_H
+
+#include <QDialog>
+#include <QEvent>
+#include <QString>
+#include <functional>
+
+class QComboBox;
+class QDialogButtonBox;
+class QLabel;
+class QLineEdit;
+class QWidget;
+
+/**
+ * @brief Modal dialog asking for the name and parent zone of a new custom deck zone.
+ *
+ * Menus construct the dialog transiently around exec(), so validation state only
+ * ever reflects the name currently typed.
+ */
+class DeckZoneDialog : public QDialog
+{
+    Q_OBJECT
+
+public:
+    /**
+     * @brief Constructs the dialog and runs the initial validation pass.
+     *
+     * @param parent The parent widget for the dialog
+     * @param initialBoardName The board zone to preselect in the combo. Unknown names
+     *        fall back to main.
+     * @param _nameValidator Given the trimmed candidate name, returns an empty string
+     *        when it is usable, otherwise a user-facing error message. May be empty.
+     * @param _allowBoardSelection When false the parent-zone combo is hidden and the
+     *        dialog acts as a rename prompt for an existing zone.
+     */
+    explicit DeckZoneDialog(QWidget *parent = nullptr,
+                            const QString &initialBoardName = {},
+                            const std::function<QString(const QString &)> &_nameValidator = {},
+                            bool _allowBoardSelection = true);
+
+    /**
+     * @brief The trimmed zone name entered by the user.
+     */
+    [[nodiscard]] QString getZoneName() const;
+
+    /**
+     * @brief The internal name of the board zone selected in the combo.
+     */
+    [[nodiscard]] QString getBoardName() const;
+
+    /**
+     * @brief Prefills the name field, e.g. with the current name when renaming.
+     *
+     * @param zoneName The text to put into the name field, selected for quick editing
+     */
+    void setZoneName(const QString &zoneName);
+
+    /**
+     * @brief Prompts the user for a new custom zone name and the board zone to nest it under.
+     *
+     * Convenience wrapper that runs DeckZoneDialog modally.
+     *
+     * @param parent The parent widget for the dialog
+     * @param initialBoardName The board zone to preselect in the dialog. Unknown names fall
+     *        back to main.
+     * @param chosenBoardName (out) The internal name of the board zone the user chose
+     * @param nameValidator Optional validator forwarded to the dialog
+     * @return The trimmed zone name, or an empty string if the user cancelled
+     */
+    static QString promptForNewZone(QWidget *parent,
+                                    const QString &initialBoardName,
+                                    QString *chosenBoardName,
+                                    const std::function<QString(const QString &)> &nameValidator = {});
+
+    /**
+     * @brief Prompts the user for a new name for an existing custom zone.
+     *
+     * Same inline validation as promptForNewZone, but without a parent-zone picker.
+     *
+     * @param parent The parent widget for the dialog
+     * @param currentZoneName The current name, prefilled for editing
+     * @param nameValidator Validator deciding whether a candidate name is usable. It sees
+     *        the current name too, so callers wanting to allow unchanged names must
+     *        special-case that themselves.
+     * @return The trimmed new name, or an empty string if the user cancelled
+     */
+    static QString promptForRename(QWidget *parent,
+                                   const QString &currentZoneName,
+                                   const std::function<QString(const QString &)> &nameValidator = {});
+
+protected:
+    void changeEvent(QEvent *event) override;
+
+private:
+    /**
+     * @brief Sets every user-visible string. Runs on construction and on runtime
+     * language changes.
+     */
+    void retranslateUi();
+
+    /**
+     * @brief Validates the current input, toggling Ok and the inline error label.
+     */
+    void validateName();
+
+    QLabel *nameLabel;
+    QLineEdit *nameEdit;
+    QLabel *errorLabel;
+    QLabel *boardLabel;
+    QComboBox *boardCombo;
+    QDialogButtonBox *buttonBox;
+    std::function<QString(const QString &)> nameValidator;
+    bool allowBoardSelection;
+};
+
+#endif // DECK_ZONE_DIALOG_H

cockatrice/src/interface/widgets/dialogs/dlg_convert_deck_to_cod_format.cpp

@@ -1,9 +1,17 @@
 #include "dlg_convert_deck_to_cod_format.h"
 
+#include "../../../client/settings/cache_settings.h"
+#include "../../deck_loader/deck_loader.h"
+
 #include <QCheckBox>
 #include <QDialogButtonBox>
+#include <QDir>
+#include <QFile>
+#include <QFileInfo>
 #include <QLabel>
+#include <QMessageBox>
 #include <QVBoxLayout>
+#include <libcockatrice/settings/visual_deck_storage_settings.h>
 
 DialogConvertDeckToCodFormat::DialogConvertDeckToCodFormat(QWidget *parent) : QDialog(parent)
 {
@@ -38,3 +46,71 @@ bool DialogConvertDeckToCodFormat::dontAskAgain() const
 {
     return dontAskAgainCheckbox->isChecked();
 }
+
+namespace
+{
+
+bool confirmOverwriteIfExists(QWidget *parent, const QString &filePath)
+{
+    QFileInfo fileInfo(filePath);
+    QString newFileName = QDir::toNativeSeparators(fileInfo.path() + "/" + fileInfo.completeBaseName() + ".cod");
+
+    if (QFile::exists(newFileName)) {
+        QMessageBox::StandardButton reply =
+            QMessageBox::question(parent, QObject::tr("Overwrite Existing File?"),
+                                  QObject::tr("A .cod version of this deck already exists. Overwrite it?"),
+                                  QMessageBox::Yes | QMessageBox::No);
+        return reply == QMessageBox::Yes;
+    }
+    return true; // Safe to proceed
+}
+
+} // namespace
+
+bool DialogConvertDeckToCodFormat::promptIfRequired(QWidget *parent,
+                                                    const QString &filePath,
+                                                    const std::function<bool()> &convert)
+{
+    if (DeckFileFormat::getFormatFromName(filePath) == DeckFileFormat::Cockatrice) {
+        return true;
+    }
+
+    // Retrieve saved preference if the prompt is disabled
+    if (!SettingsCache::instance().visualDeckStorage().getVisualDeckStoragePromptForConversion()) {
+        if (!SettingsCache::instance().visualDeckStorage().getVisualDeckStorageAlwaysConvert()) {
+            return false;
+        }
+
+        if (!confirmOverwriteIfExists(parent, filePath)) {
+            return false;
+        }
+
+        return convert();
+    }
+
+    // Show the dialog to the user
+    DialogConvertDeckToCodFormat conversionDialog(parent);
+    if (conversionDialog.exec() != QDialog::Accepted) {
+        SettingsCache::instance().visualDeckStorage().setVisualDeckStoragePromptForConversion(
+            !conversionDialog.dontAskAgain());
+        SettingsCache::instance().visualDeckStorage().setVisualDeckStorageAlwaysConvert(false);
+
+        return false;
+    }
+
+    // Try to convert file
+    if (!confirmOverwriteIfExists(parent, filePath)) {
+        return false;
+    }
+
+    if (!convert()) {
+        return false;
+    }
+
+    if (conversionDialog.dontAskAgain()) {
+        SettingsCache::instance().visualDeckStorage().setVisualDeckStoragePromptForConversion(false);
+        SettingsCache::instance().visualDeckStorage().setVisualDeckStorageAlwaysConvert(true);
+    }
+
+    return true;
+}

cockatrice/src/interface/widgets/dialogs/dlg_convert_deck_to_cod_format.h

@@ -13,6 +13,9 @@
 #include <QDialogButtonBox>
 #include <QLabel>
 #include <QVBoxLayout>
+#include <functional>
+
+class QWidget;
 
 class DialogConvertDeckToCodFormat : public QDialog
 {
@@ -24,6 +27,21 @@ public:
 
     [[nodiscard]] bool dontAskAgain() const;
 
+    /**
+     * @brief Checks whether the deck file at \a filePath can store tags.
+     *
+     * If the file is not a .cod deck, prompts the user for conversion to the
+     * Cockatrice format, honoring the saved "always convert / don't ask again"
+     * preference. On acceptance \a convert is called to perform the conversion.
+     *
+     * @param parent The widget to parent the prompt to.
+     * @param filePath The path of the deck file to check.
+     * @param convert Called to convert the deck once the user agrees.
+     * @return true if tags can be stored (no conversion needed, or the conversion
+     *         was performed), false if the user declined to convert.
+     */
+    static bool promptIfRequired(QWidget *parent, const QString &filePath, const std::function<bool()> &convert);
+
 private:
     QVBoxLayout *layout;
     QLabel *label;

cockatrice/src/interface/widgets/server/user/user_info_popup.cpp

@@ -525,6 +525,13 @@ void UserInfoPopup::rebuildActionButtons(const ServerInfo_User &userInfo, bool o
     connect(games, &QPushButton::clicked, this, [this, name] { emit showGamesRequested(name); });
     add(games);
 
+    // ── Invite (only while the inviter has a joinable game for this user) ────
+    if (!isSelf && online && gameInviteAvailable && gameInviteAvailable(name)) {
+        auto *invite = makeBtn(tr("Invite"), tr("Invite to your game"), actionArea, theme);
+        connect(invite, &QPushButton::clicked, this, [this, name] { emit inviteRequested(name); });
+        add(invite);
+    }
+
     // ── Buddy / ignore (registered users only) ────────────────────────────────
     if (!isSelf && isReg) {
         if (isBuddy) {

cockatrice/src/interface/widgets/server/user/user_info_popup.h

@@ -9,6 +9,7 @@
 #include <QMap>
 #include <QPixmap>
 #include <QStandardItemModel>
+#include <functional>
 #include <libcockatrice/network/server/remote/user_level.h>
 #include <libcockatrice/protocol/pb/response.pb.h>
 #include <libcockatrice/protocol/pb/serverinfo_game.pb.h>
@@ -149,6 +150,17 @@ public:
     /** Re-pulls the avatar/card art for the currently shown user (e.g. after it loads). */
     void refreshHeader();
 
+    /**
+     * Sets a predicate evaluated on every action-button rebuild. It receives
+     * the name of the user the popup currently shows; when it returns true an
+     * "Invite" button is shown. The popup itself never resolves the invite
+     * link, it just forwards the request.
+     */
+    void setGameInviteAvailable(std::function<bool(const QString &userName)> available)
+    {
+        gameInviteAvailable = std::move(available);
+    }
+
 signals:
     void mouseEnteredPopup();
     void mouseLeftPopup();
@@ -159,6 +171,7 @@ signals:
 
     // ── Action signals — connect to UserContextMenu::exec*() ──────────────────
     void chatRequested(const QString &userName);
+    void inviteRequested(const QString &userName);
     void detailsRequested(const QString &userName);
     void showGamesRequested(const QString &userName);
     void addBuddyRequested(const QString &userName);
@@ -200,6 +213,7 @@ private:
     QString currentUser;
     ServerInfo_User currentUserInfo;
     bool currentOnline = false;
+    std::function<bool(const QString &userName)> gameInviteAvailable;
 
     UserInfoHeaderWidget *header;
     QWidget *actionArea; ///< rebuilt per user

cockatrice/src/interface/widgets/server/user/user_list_widget.cpp

@@ -345,6 +345,11 @@ UserListWidget::UserListWidget(TabSupervisor *_tabSupervisor,
                                           &cardArtProvider->cache(), &cardArtParamsMap,
                                           window()); // parented to main window so it floats above siblings
 
+        // The invite availability is scoped to the room this list belongs to,
+        // and gated on the room's buddy-only setting for the hovered user.
+        userInfoPopup->setGameInviteAvailable(
+            [this](const QString &userName) { return userContextMenu->hasGameInviteLink(userName); });
+
         userInfoPopup->hide();
         userInfoPopup->setWindowOpacity(0.0);
         userInfoPopup->installEventFilter(this);
@@ -662,6 +667,8 @@ void UserListWidget::connectPopupSignals()
 
     // Wire all action signals to UserContextMenu::exec*()
     connect(userInfoPopup, &UserInfoPopup::chatRequested, userContextMenu, &UserContextMenu::execChat);
+    connect(userInfoPopup, &UserInfoPopup::inviteRequested, this,
+            [this](const QString &userName) { userContextMenu->execInvite(userName); });
     connect(userInfoPopup, &UserInfoPopup::detailsRequested, userContextMenu, &UserContextMenu::execDetails);
     connect(userInfoPopup, &UserInfoPopup::showGamesRequested, userContextMenu, &UserContextMenu::execShowGames);
     connect(userInfoPopup, &UserInfoPopup::addBuddyRequested, userContextMenu, &UserContextMenu::execAddToBuddy);

cockatrice/src/interface/widgets/server/user/user_list_widget.h

@@ -22,6 +22,7 @@
 #include <QTextEdit>
 #include <QTreeWidgetItem>
 #include <functional>
+#include <libcockatrice/network/server/remote/user_level.h>
 #include <libcockatrice/protocol/pb/moderator_commands.pb.h>
 
 class QTreeWidget;

cockatrice/src/interface/widgets/tabs/tab_supervisor.cpp

@@ -1091,7 +1091,8 @@ QList<GameInviteOption> TabSupervisor::getGameInviteLinksForRoom(int roomId) con
     // The inviter may be in several games of the same room (hosting one and
     // spectating another, for example). Return every game so the caller can
     // let the user choose which one to invite to.
-    for (TabGame *tab : gameTabs) {
+    for (auto it = gameTabs.cbegin(); it != gameTabs.cend(); ++it) {
+        TabGame *tab = it.value();
         GameMetaInfo *metaInfo = tab->getGame()->getGameMetaInfo();
         if (metaInfo->proto().room_id() != roomId) {
             continue;

cockatrice/src/interface/widgets/tabs/visual_deck_editor/tab_deck_editor_visual.cpp

@@ -4,6 +4,7 @@
 #include "../../../../client/settings/shortcuts_settings.h"
 #include "../../cards/card_info_display_widget.h"
 #include "../../deck_editor/deck_state_manager.h"
+#include "../../deck_editor/deck_zone_dialog.h"
 #include "../../filters/filter_builder.h"
 #include "../../interface/pixel_map_generator.h"
 #include "../../interface/widgets/cards/card_info_frame_widget.h"
@@ -84,6 +85,7 @@ void TabDeckEditorVisual::createCentralFrame()
     connect(tabContainer, &TabDeckEditorVisualTabWidget::printingSelectorRequested, this,
             &TabDeckEditorVisual::showPrintingSelector);
     connect(tabContainer, &TabDeckEditorVisualTabWidget::cardInfoRequested, this, &TabDeckEditorVisual::updateCardInfo);
+    connect(tabContainer, &TabDeckEditorVisualTabWidget::newZoneRequested, this, &TabDeckEditorVisual::createNewZone);
 
     centralFrame->addWidget(tabContainer);
     setCentralWidget(centralWidget);
@@ -269,6 +271,18 @@ bool TabDeckEditorVisual::actSaveDeckAs()
     return result;
 }
 
+/** @brief Prompts for and creates a new custom deck zone. */
+void TabDeckEditorVisual::createNewZone()
+{
+    QString boardName;
+    const QString zoneName = DeckZoneDialog::promptForNewZone(this, {}, &boardName, [this](const QString &candidate) {
+        return deckStateManager->validateNewZoneName(candidate);
+    });
+    if (!zoneName.isEmpty()) {
+        deckStateManager->createCustomZone(boardName, zoneName);
+    }
+}
+
 /** @brief Refreshes keyboard shortcuts for this tab from settings. */
 void TabDeckEditorVisual::refreshShortcuts()
 {

cockatrice/src/interface/widgets/tabs/visual_deck_editor/tab_deck_editor_visual.h

@@ -165,6 +165,11 @@ public slots:
      */
     bool actSaveDeckAs() override;
 
+    /**
+     * @brief Prompts for and creates a new custom deck zone.
+     */
+    void createNewZone();
+
 private:
     /**
      * @brief Sets the deck for this tab and selects the sub-tab to open on

cockatrice/src/interface/widgets/tabs/visual_deck_editor/tab_deck_editor_visual_tab_widget.cpp

@@ -51,6 +51,8 @@ TabDeckEditorVisualTabWidget::TabDeckEditorVisualTabWidget(QWidget *parent,
             &TabDeckEditorVisualTabWidget::printingSelectorRequested);
     connect(visualDatabaseDisplay, &VisualDatabaseDisplayWidget::cardInfoRequested, this,
             &TabDeckEditorVisualTabWidget::cardInfoRequested);
+    connect(visualDatabaseDisplay, &VisualDatabaseDisplayWidget::newZoneRequested, this,
+            &TabDeckEditorVisualTabWidget::newZoneRequested);
 
     statsAnalyzer = new DeckListStatisticsAnalyzer(this, deckModel);
     statsAnalyzer->analyze();

cockatrice/src/interface/widgets/tabs/visual_deck_editor/tab_deck_editor_visual_tab_widget.h

@@ -133,6 +133,7 @@ signals:
     void edhrecRequested(const CardInfoPtr &cardInfo, bool isCommander);
     void printingSelectorRequested();
     void cardInfoRequested(const ExactCard &cardName);
+    void newZoneRequested();
 
 private:
     QVBoxLayout *layout;                  ///< Layout for tabs and controls.

cockatrice/src/interface/widgets/visual_database_display/visual_database_display_widget.cpp

@@ -21,6 +21,7 @@
 #include <libcockatrice/card/card_info_comparator.h>
 #include <libcockatrice/card/database/card_database.h>
 #include <libcockatrice/card/database/card_database_manager.h>
+#include <libcockatrice/deck_list/tree/inner_deck_list_node.h>
 #include <libcockatrice/settings/cards_display_settings.h>
 #include <utility>
 
@@ -89,6 +90,19 @@ VisualDatabaseDisplayWidget::VisualDatabaseDisplayWidget(QWidget *parent,
     databaseView->setItemDelegate(nullptr);
     databaseView->setVisible(false);
 
+    // Without a deck model there is nothing to add cards to, so the zone menu stays hidden.
+    if (deckListModel) {
+        databaseView->setZoneMenuProvider(
+            [deckListModel]() -> QList<QPair<QString, QStringList>> {
+                QList<QPair<QString, QStringList>> result;
+                for (const QString &boardName : InnerDecklistNode::boardZoneNames()) {
+                    result.append({boardName, deckListModel->getCustomZoneNames(boardName)});
+                }
+                return result;
+            },
+            [this] { emit newZoneRequested(); });
+    }
+
     searchEdit->setTreeView(databaseView);
     searchEdit->installEventFilter(databaseView->getKeySignals());
 

cockatrice/src/interface/widgets/visual_database_display/visual_database_display_widget.h

@@ -78,6 +78,7 @@ signals:
     void edhrecRequested(const CardInfoPtr &cardInfo, bool isCommander);
     void printingSelectorRequested();
     void cardInfoRequested(const ExactCard &cardName);
+    void newZoneRequested();
 
 protected slots:
     void initialize();

cockatrice/src/interface/widgets/visual_deck_storage/deck_preview/deck_preview_widget.cpp

@@ -10,8 +10,6 @@
 #include "../visual_deck_storage_widget.h"
 #include "deck_preview_deck_tags_display_widget.h"
 
-#include <QDir>
-#include <QFile>
 #include <QFileInfo>
 #include <QInputDialog>
 #include <QLabel>
@@ -499,21 +497,6 @@ void DeckPreviewWidget::actDeleteFile()
     // The folder widget removes this preview once the row is gone.
 }
 
-static bool confirmOverwriteIfExists(QWidget *parent, const QString &filePath)
-{
-    QFileInfo fileInfo(filePath);
-    QString newFileName = QDir::toNativeSeparators(fileInfo.path() + "/" + fileInfo.completeBaseName() + ".cod");
-
-    if (QFile::exists(newFileName)) {
-        QMessageBox::StandardButton reply =
-            QMessageBox::question(parent, QObject::tr("Overwrite Existing File?"),
-                                  QObject::tr("A .cod version of this deck already exists. Overwrite it?"),
-                                  QMessageBox::Yes | QMessageBox::No);
-        return reply == QMessageBox::Yes;
-    }
-    return true; // Safe to proceed
-}
-
 /**
  * Checks if the deck's file format supports tags.
  * If not, then prompt the user for file conversion.
@@ -521,45 +504,8 @@ static bool confirmOverwriteIfExists(QWidget *parent, const QString &filePath)
  */
 bool DeckPreviewWidget::promptFileConversionIfRequired()
 {
-    if (DeckFileFormat::getFormatFromName(filePath) == DeckFileFormat::Cockatrice) {
-        return true;
-    }
-
-    // Retrieve saved preference if the prompt is disabled
-    if (!SettingsCache::instance().visualDeckStorage().getVisualDeckStoragePromptForConversion()) {
-        if (!SettingsCache::instance().visualDeckStorage().getVisualDeckStorageAlwaysConvert()) {
-            return false;
-        }
-
-        if (!confirmOverwriteIfExists(this, filePath)) {
-            return false;
-        }
-
+    return DialogConvertDeckToCodFormat::promptIfRequired(this, filePath, [this] {
         model->convertToCockatriceFormat(row());
         return true;
-    }
-
-    // Show the dialog to the user
-    DialogConvertDeckToCodFormat conversionDialog(this);
-    if (conversionDialog.exec() != QDialog::Accepted) {
-        SettingsCache::instance().visualDeckStorage().setVisualDeckStoragePromptForConversion(
-            !conversionDialog.dontAskAgain());
-        SettingsCache::instance().visualDeckStorage().setVisualDeckStorageAlwaysConvert(false);
-
-        return false;
-    }
-
-    // Try to convert file
-    if (!confirmOverwriteIfExists(this, filePath)) {
-        return false;
-    }
-
-    model->convertToCockatriceFormat(row());
-
-    if (conversionDialog.dontAskAgain()) {
-        SettingsCache::instance().visualDeckStorage().setVisualDeckStoragePromptForConversion(false);
-        SettingsCache::instance().visualDeckStorage().setVisualDeckStorageAlwaysConvert(true);
-    }
-
-    return true;
+    });
 }

libcockatrice_deck_list/libcockatrice/deck_list/tree/inner_deck_list_node.cpp

@@ -43,6 +43,13 @@ void InnerDecklistNode::setSortMethod(DeckSortMethod method)
     }
 }
 
+const QList<QString> &InnerDecklistNode::boardZoneNames()
+{
+    static const QList<QString> names = {QString(DECK_ZONE_MAIN), QString(DECK_ZONE_SIDE),
+                                         QString(DECK_ZONE_MAYBEBOARD)};
+    return names;
+}
+
 QString InnerDecklistNode::getVisibleName() const
 {
     return visibleNameFromName(name);

libcockatrice_deck_list/libcockatrice/deck_list/tree/inner_deck_list_node.h

@@ -18,6 +18,9 @@
 
 #include "abstract_deck_list_node.h"
 
+#include <QList>
+#include <QString>
+
 /** @brief Constant for the "main" deck zone name. */
 #define DECK_ZONE_MAIN "main"
 /** @brief Constant for the "sideboard" zone name. */
@@ -118,6 +121,13 @@ public:
      */
     static QString visibleNameFromName(const QString &_name);
 
+    /**
+     * @brief The standard board zone names, in display order.
+     *
+     * @return main, side and maybeboard.
+     */
+    static const QList<QString> &boardZoneNames();
+
     /**
      * @brief Get this node’s display-friendly name.
      * @return Human-readable name (zone/group name).

libcockatrice_models/libcockatrice/models/deck_list/CMakeLists.txt

@@ -7,7 +7,8 @@ set(HEADERS deck_list_model.h deck_list_sort_filter_proxy_model.h)
 qt6_wrap_cpp(MOC_SOURCES ${HEADERS})
 
 add_library(
-  libcockatrice_models_deck_list STATIC ${MOC_SOURCES} deck_list_model.cpp deck_list_sort_filter_proxy_model.cpp
+  libcockatrice_models_deck_list STATIC ${MOC_SOURCES} deck_list_model.cpp deck_list_model_custom_zones.cpp
+                                        deck_list_sort_filter_proxy_model.cpp
 )
 
 target_include_directories(libcockatrice_models_deck_list PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})

libcockatrice_models/libcockatrice/models/deck_list/deck_list_model.cpp

@@ -66,7 +66,8 @@ void DeckListModel::rebuildTree()
         for (int j = 0; j < currentZone->size(); j++) {
             auto *currentCard = dynamic_cast<DecklistCardNode *>(currentZone->at(j));
 
-            //! \todo Better sanity checking.
+            // Non-card children are custom zones; they are mirrored in a single
+            // pass below so each is mirrored exactly once.
             if (currentCard == nullptr) {
                 continue;
             }
@@ -82,8 +83,19 @@ void DeckListModel::rebuildTree()
 
             new DecklistModelCardNode(currentCard, groupNode);
         }
+
+        // Custom zones nested under the board zone are mirrored as-is, with their
+        // cards as direct children (no further grouping).
+        DeckListModelCustomZones::mirrorCustomZones(currentZone, node);
     }
 
+    // The shadow tree was built in deck file order. Apply the active sort while
+    // the reset is still open so every consumer (tree view and visual editor)
+    // sees the canonical order from the start. sortShadowTree emits no signals,
+    // which is only valid before endResetModel closes the reset.
+    root->setSortMethod(lastKnownColumn == 0 ? DeckSortMethod::ByNumber : DeckSortMethod::ByName);
+    sortShadowTree(root, lastKnownOrder);
+
     endResetModel();
 
     refreshCardFormatLegalities();
@@ -154,6 +166,9 @@ QVariant DeckListModel::data(const QModelIndex &index, int role) const
             case DeckRoles::IsLegalRole:
                 return true;
 
+            case DeckRoles::IsCustomZoneRole:
+                return DeckListModelCustomZones::isCustomZone(group);
+
             default:
                 return {};
         }
@@ -190,6 +205,10 @@ QVariant DeckListModel::data(const QModelIndex &index, int role) const
             return card->getFormatLegality();
         }
 
+        case DeckRoles::IsCustomZoneRole: {
+            return false;
+        }
+
         default: {
             return {};
         }
@@ -327,6 +346,13 @@ bool DeckListModel::removeRows(int row, int count, const QModelIndex &parent)
         return false;
     }
 
+    // Custom zone rows are managed through the deck tree, never removed as model rows.
+    for (int i = 0; i < count; i++) {
+        if (DeckListModelCustomZones::isCustomZone(node->at(row + i))) {
+            return false;
+        }
+    }
+
     beginRemoveRows(parent, row, row + count - 1);
     for (int i = 0; i < count; i++) {
         AbstractDecklistNode *toDelete = node->takeAt(row);
@@ -337,7 +363,8 @@ bool DeckListModel::removeRows(int row, int count, const QModelIndex &parent)
     }
     endRemoveRows();
 
-    if (node->empty() && (node != root)) {
+    // Empty criteria groups get pruned, but custom zones stay until explicitly deleted.
+    if (node->empty() && (node != root) && !DeckListModelCustomZones::isCustomZone(node)) {
         removeRows(parent.row(), 1, parent.parent());
     } else {
         emitRecursiveUpdates(parent);
@@ -365,24 +392,44 @@ DecklistModelCardNode *DeckListModel::findCardNode(const QString &cardName,
                                                    const QString &providerId,
                                                    const QString &cardNumber) const
 {
-    InnerDecklistNode *zoneNode = dynamic_cast<InnerDecklistNode *>(root->findChild(zoneName));
-    if (!zoneNode) {
-        return nullptr;
-    }
-
     CardInfoPtr info = CardDatabaseManager::query()->getCardInfo(cardName);
     if (!info) {
         return nullptr;
     }
 
-    QString groupCriteria = extractGroupCriteriaValue(info, activeGroupCriteria);
-    InnerDecklistNode *groupNode = dynamic_cast<InnerDecklistNode *>(zoneNode->findChild(groupCriteria));
-    if (!groupNode) {
-        return nullptr;
+    // 1. Board zone lookup: search the criteria groups, then the custom zones
+    //    nested under the board.
+    if (auto *zoneNode = dynamic_cast<InnerDecklistNode *>(root->findChild(zoneName))) {
+        QString groupCriteria = extractGroupCriteriaValue(info, activeGroupCriteria);
+        if (auto *groupNode = dynamic_cast<InnerDecklistNode *>(zoneNode->findChild(groupCriteria))) {
+            if (auto *card = dynamic_cast<DecklistModelCardNode *>(
+                    groupNode->findCardChildByNameProviderIdAndNumber(cardName, providerId, cardNumber))) {
+                return card;
+            }
+        }
+
+        for (auto *child : *zoneNode) {
+            if (!DeckListModelCustomZones::isCustomZone(child)) {
+                continue;
+            }
+            auto *customZone = dynamic_cast<InnerDecklistNode *>(child);
+            if (!customZone) {
+                continue;
+            }
+            if (auto *card = dynamic_cast<DecklistModelCardNode *>(
+                    customZone->findCardChildByNameProviderIdAndNumber(cardName, providerId, cardNumber))) {
+                return card;
+            }
+        }
     }
 
-    return dynamic_cast<DecklistModelCardNode *>(
-        groupNode->findCardChildByNameProviderIdAndNumber(cardName, providerId, cardNumber));
+    // 2. Custom zone lookup by name (custom zone names are deck-unique).
+    if (auto *customZone = DeckListModelCustomZones::findSubZoneByName(root, zoneName)) {
+        return dynamic_cast<DecklistModelCardNode *>(
+            customZone->findCardChildByNameProviderIdAndNumber(cardName, providerId, cardNumber));
+    }
+
+    return nullptr;
 }
 
 QModelIndex DeckListModel::findCard(const QString &cardName,
@@ -423,29 +470,43 @@ QModelIndex DeckListModel::addCard(const ExactCard &card, const QString &zoneNam
         return {};
     }
 
-    InnerDecklistNode *zoneNode = createNodeIfNeeded(zoneName, root);
-
     CardInfoPtr cardInfo = card.getCardPtr();
     PrintingInfo printingInfo = card.getPrinting();
 
-    QString groupCriteria = extractGroupCriteriaValue(cardInfo, activeGroupCriteria);
-    InnerDecklistNode *groupNode = createNodeIfNeeded(groupCriteria, zoneNode);
+    InnerDecklistNode *cardParent = nullptr;
 
-    const QModelIndex parentIndex = nodeToIndex(groupNode);
-    auto *cardNode = dynamic_cast<DecklistModelCardNode *>(groupNode->findCardChildByNameProviderIdAndNumber(
+    auto *boardNode = dynamic_cast<InnerDecklistNode *>(root->findChild(zoneName));
+    auto *customZoneNode = boardNode ? nullptr : DeckListModelCustomZones::findSubZoneByName(root, zoneName);
+
+    if (boardNode) {
+        // Board zone: cards are grouped by the active criteria.
+        QString groupCriteria = extractGroupCriteriaValue(cardInfo, activeGroupCriteria);
+        cardParent = createNodeIfNeeded(groupCriteria, boardNode);
+    } else if (customZoneNode) {
+        // Custom zone: cards live flat inside the zone.
+        cardParent = customZoneNode;
+    } else {
+        // Unknown zone: create a top-level zone (legacy behavior).
+        QString groupCriteria = extractGroupCriteriaValue(cardInfo, activeGroupCriteria);
+        auto *newZone = createNodeIfNeeded(zoneName, root);
+        cardParent = createNodeIfNeeded(groupCriteria, newZone);
+    }
+
+    const QModelIndex parentIndex = nodeToIndex(cardParent);
+    auto *cardNode = dynamic_cast<DecklistModelCardNode *>(cardParent->findCardChildByNameProviderIdAndNumber(
         card.getName(), printingInfo.getUuid(), printingInfo.getProperty("num")));
     const auto cardSetName = printingInfo.getSet().isNull() ? "" : printingInfo.getSet()->getCorrectedShortName();
 
     bool cardNodeAdded = false;
     if (!cardNode) {
         // Determine the correct index
-        int insertRow = findSortedInsertRow(groupNode, cardInfo);
+        int insertRow = findSortedInsertRow(cardParent, cardInfo);
 
         auto *decklistCard = deckList->addCard(cardInfo->getName(), zoneName, insertRow, cardSetName,
                                                printingInfo.getProperty("num"), printingInfo.getProperty("uuid"));
 
         beginInsertRows(parentIndex, insertRow, insertRow);
-        cardNode = new DecklistModelCardNode(decklistCard, groupNode, insertRow);
+        cardNode = new DecklistModelCardNode(decklistCard, cardParent, insertRow);
         endInsertRows();
 
         cardNodeAdded = true;
@@ -576,21 +637,41 @@ QModelIndex DeckListModel::nodeToIndex(AbstractDecklistNode *node) const
     return createIndex(node->getParent()->indexOf(node), 0, node);
 }
 
+/**
+ * @brief Sorts a freshly built shadow subtree without emitting model signals.
+ *
+ * Used by rebuildTree while the model reset is still open (emitting layout
+ * changes during a reset is invalid). Reorders every node just like
+ * sortHelper does, but ignores the movement mapping because there are no
+ * persistent indices established yet.
+ */
+void DeckListModel::sortShadowTree(InnerDecklistNode *node, Qt::SortOrder order)
+{
+    // The mapping is not needed: fresh shadow nodes have no persistent indices yet.
+    (void)DeckListModelCustomZones::sortWithCustomZonesLast(root, node, order);
+
+    for (int i = node->size() - 1; i >= 0; --i) {
+        if (auto *subNode = dynamic_cast<InnerDecklistNode *>(node->at(i))) {
+            sortShadowTree(subNode, order);
+        }
+    }
+}
+
 void DeckListModel::sortHelper(InnerDecklistNode *node, Qt::SortOrder order)
 {
-    // Sort children of node and save the information needed to
-    // update the list of persistent indexes.
-    QVector<QPair<int, int>> sortResult = node->sort(order);
+    // Sort children (custom zones always sorted after groups within a board) and
+    // use the movement mapping to update the list of persistent indices.
+    const auto mapping = DeckListModelCustomZones::sortWithCustomZonesLast(root, node, order);
 
     QModelIndexList from, to;
     int columns = columnCount();
-    for (int i = sortResult.size() - 1; i >= 0; --i) {
-        const int fromRow = sortResult[i].first;
-        const int toRow = sortResult[i].second;
-        AbstractDecklistNode *temp = node->at(toRow);
+    for (const auto &move : mapping) {
+        const int preSortRow = move.first;
+        const int finalRow = move.second;
+        AbstractDecklistNode *temp = node->at(finalRow);
         for (int j = 0; j < columns; ++j) {
-            from << createIndex(fromRow, j, temp);
-            to << createIndex(toRow, j, temp);
+            from << createIndex(preSortRow, j, temp);
+            to << createIndex(finalRow, j, temp);
         }
     }
     changePersistentIndexList(from, to);
@@ -704,6 +785,15 @@ QList<QString> DeckListModel::getZones() const
     return zones;
 }
 
+QStringList DeckListModel::getCustomZoneNames(const QString &boardZoneName) const
+{
+    QStringList zoneNames;
+    for (const auto *customZone : deckList->getTree()->getCustomZones(boardZoneName)) {
+        zoneNames.append(customZone->getName());
+    }
+    return zoneNames;
+}
+
 static int maxAllowedForLegality(const FormatRules &format, const QString &legality)
 {
     for (const AllowedCount &c : format.allowedCounts) {

libcockatrice_models/libcockatrice/models/deck_list/deck_list_model.h

@@ -1,6 +1,8 @@
 #ifndef DECKLISTMODEL_H
 #define DECKLISTMODEL_H
 
+#include "deck_list_model_custom_zones.h"
+
 #include <../../../../libcockatrice_deck_list/libcockatrice/deck_list/tree/abstract_deck_list_card_node.h>
 #include <../../../../libcockatrice_deck_list/libcockatrice/deck_list/tree/deck_list_card_node.h>
 #include <QAbstractItemModel>
@@ -30,7 +32,8 @@ enum
 {
     IsCardRole = Qt::UserRole + 1, /**< Indicates whether the item represents a card. */
     DepthRole,                     /**< Depth level within the deck's grouping hierarchy. */
-    IsLegalRole                    /**< Whether the card is legal in the current deck format. */
+    IsLegalRole,                   /**< Whether the card is legal in the current deck format. */
+    IsCustomZoneRole               /**< Whether the item represents a custom zone nested under a board zone. */
 };
 } // namespace DeckRoles
 
@@ -391,6 +394,14 @@ public:
      */
     [[nodiscard]] QList<QString> getZones() const;
 
+    /**
+     * @brief Gets the names of the custom zones nested under the given board zone.
+     *
+     * @param boardZoneName The board zone to query (main/side/maybeboard)
+     * @return The custom zone names, in deck order
+     */
+    [[nodiscard]] QStringList getCustomZoneNames(const QString &boardZoneName) const;
+
 private:
     QSharedPointer<DeckList> deckList; /**< Pointer to the decklist providing the underlying data. */
     InnerDecklistNode *root;           /**< Root node of the model tree. */
@@ -427,6 +438,7 @@ private:
     void emitRecursiveUpdates(const QModelIndex &index);
 
     void sortHelper(InnerDecklistNode *node, Qt::SortOrder order);
+    void sortShadowTree(InnerDecklistNode *node, Qt::SortOrder order);
 
     template <typename T> T getNode(const QModelIndex &index) const
     {

libcockatrice_models/libcockatrice/models/deck_list/deck_list_model_custom_zones.cpp

@@ -0,0 +1,123 @@
+#include "deck_list_model_custom_zones.h"
+
+#include "deck_list_model.h"
+
+#include <../../../../libcockatrice_deck_list/libcockatrice/deck_list/tree/deck_list_card_node.h>
+#include <QHash>
+#include <QVector>
+
+namespace DeckListModelCustomZones
+{
+
+bool isCustomZone(const AbstractDecklistNode *node)
+{
+    return dynamic_cast<const DecklistModelSubZoneNode *>(node) != nullptr;
+}
+
+void mirrorCustomZones(const InnerDecklistNode *deckBoardZone, InnerDecklistNode *shadowBoardZone)
+{
+    for (int j = 0; j < deckBoardZone->size(); j++) {
+        auto *customCard = dynamic_cast<DecklistCardNode *>(deckBoardZone->at(j));
+        if (customCard) {
+            continue;
+        }
+
+        auto *customZone = dynamic_cast<const InnerDecklistNode *>(deckBoardZone->at(j));
+        if (!customZone) {
+            continue;
+        }
+
+        auto *shadowZone = new DecklistModelSubZoneNode(customZone->getName(), shadowBoardZone);
+        for (int k = 0; k < customZone->size(); k++) {
+            if (auto *zoneCard = dynamic_cast<DecklistCardNode *>(customZone->at(k))) {
+                new DecklistModelCardNode(zoneCard, shadowZone);
+            }
+        }
+    }
+}
+
+DecklistModelSubZoneNode *findSubZoneByName(InnerDecklistNode *root, const QString &zoneName)
+{
+    for (int i = 0; i < root->size(); i++) {
+        auto *boardZone = dynamic_cast<InnerDecklistNode *>(root->at(i));
+        if (!boardZone) {
+            continue;
+        }
+
+        for (int j = 0; j < boardZone->size(); j++) {
+            auto *customZone = dynamic_cast<DecklistModelSubZoneNode *>(boardZone->at(j));
+            if (customZone && customZone->getName() == zoneName) {
+                return customZone;
+            }
+        }
+    }
+
+    return nullptr;
+}
+
+namespace
+{
+
+/**
+ * @brief Sorts a node's children and returns the (preSortRow, finalRow) mapping.
+ */
+QList<QPair<int, int>> plainSort(InnerDecklistNode *node, Qt::SortOrder order)
+{
+    const QVector<QPair<int, int>> sortResult = node->sort(order);
+
+    QList<QPair<int, int>> mapping;
+    mapping.reserve(node->size());
+    for (int i = 0; i < node->size(); ++i) {
+        mapping.append({sortResult[i].first, i});
+    }
+    return mapping;
+}
+
+/**
+ * @brief Sorts a board zone's children, then stably moves custom zones to the end.
+ *
+ * @return The (preSortRow, finalRow) mapping covering both the sort and the shift.
+ */
+QList<QPair<int, int>> boardSort(InnerDecklistNode *node, Qt::SortOrder order)
+{
+    const QVector<QPair<int, int>> sortResult = node->sort(order);
+
+    QVector<AbstractDecklistNode *> groups;
+    QVector<AbstractDecklistNode *> customZones;
+    QHash<AbstractDecklistNode *, int> preSortRowOf;
+
+    groups.reserve(node->size());
+    customZones.reserve(node->size());
+
+    for (int i = 0; i < node->size(); ++i) {
+        AbstractDecklistNode *child = node->at(i);
+        preSortRowOf.insert(child, sortResult[i].first);
+        if (isCustomZone(child)) {
+            customZones.append(child);
+        } else {
+            groups.append(child);
+        }
+    }
+
+    QVector<AbstractDecklistNode *> ordered = groups + customZones;
+    for (int i = 0; i < ordered.size(); ++i) {
+        node->replace(i, ordered[i]);
+    }
+
+    QList<QPair<int, int>> mapping;
+    mapping.reserve(ordered.size());
+    for (int i = 0; i < ordered.size(); ++i) {
+        mapping.append({preSortRowOf.value(ordered[i]), i});
+    }
+    return mapping;
+}
+
+} // namespace
+
+QList<QPair<int, int>> sortWithCustomZonesLast(InnerDecklistNode *root, InnerDecklistNode *node, Qt::SortOrder order)
+{
+    const bool isBoardZone = (node != root) && (node->getParent() == root);
+    return isBoardZone ? boardSort(node, order) : plainSort(node, order);
+}
+
+} // namespace DeckListModelCustomZones

libcockatrice_models/libcockatrice/models/deck_list/deck_list_model_custom_zones.h

@@ -0,0 +1,83 @@
+#ifndef DECK_LIST_MODEL_CUSTOM_ZONES_H
+#define DECK_LIST_MODEL_CUSTOM_ZONES_H
+
+#include <../../../../libcockatrice_deck_list/libcockatrice/deck_list/tree/inner_deck_list_node.h>
+#include <QList>
+#include <QPair>
+#include <QtGlobal>
+
+/**
+ * @class DecklistModelSubZoneNode
+ * @ingroup DeckModels
+ * @brief Model node representing a custom zone nested under a board zone.
+ *
+ * Custom zones group cards by user-defined names (e.g. "Removal", "Utility")
+ * inside a board zone. They are mirrored from the underlying deck tree so that
+ * they can be told apart from criteria group nodes by type.
+ */
+class DecklistModelSubZoneNode : public InnerDecklistNode
+{
+public:
+    using InnerDecklistNode::InnerDecklistNode;
+};
+
+/**
+ * @namespace DeckListModelCustomZones
+ * @ingroup DeckModels
+ * @brief Tree-level helpers for the deck list model's custom-zone shadow nodes.
+ *
+ * The deck list model keeps a second "shadow" tree of InnerDecklistNode that
+ * mirrors the canonical deck tree for grouping and sorting. Custom zones add a
+ * layer of bookkeeping to that shadow tree: they must be mirrored alongside
+ * criteria groups, always sort after the groups within a board, and be
+ * resolvable by deck-unique name.
+ *
+ * This namespace centralizes every "what is / where is a custom zone" decision
+ * so the model itself only wires the results into Qt model signals.
+ */
+namespace DeckListModelCustomZones
+{
+
+/**
+ * @brief Whether the given node is a custom zone (as opposed to a criteria group).
+ */
+[[nodiscard]] bool isCustomZone(const AbstractDecklistNode *node);
+
+/**
+ * @brief Mirrors the custom zones of a deck board zone into its shadow board node.
+ *
+ * Each custom zone becomes a DecklistModelSubZoneNode under @p shadowBoardZone
+ * with its cards as direct (un-grouped) children.
+ *
+ * @param deckBoardZone The board zone in the canonical deck tree.
+ * @param shadowBoardZone The matching board zone in the model's shadow tree.
+ */
+void mirrorCustomZones(const InnerDecklistNode *deckBoardZone, InnerDecklistNode *shadowBoardZone);
+
+/**
+ * @brief Finds a custom zone in the shadow tree by deck-unique name.
+ * @param root Root of the shadow tree.
+ * @param zoneName The custom zone name to find.
+ * @return The matching custom zone node, or nullptr if not found.
+ */
+[[nodiscard]] DecklistModelSubZoneNode *findSubZoneByName(InnerDecklistNode *root, const QString &zoneName);
+
+/**
+ * @brief Sorts a shadow node's children, keeping a board's custom zones last.
+ *
+ * Sorting alone would interleave custom zones with criteria groups by name, but
+ * custom zones must always stay after the groups within a board, regardless of
+ * name. This applies the sort and, for board zones, stably moves the custom
+ * zones to the end.
+ *
+ * @param root Root of the shadow tree (used to classify board zones).
+ * @param node The shadow node whose children are reordered.
+ * @param order Sort order to apply.
+ * @return A list of (preSortRow, finalRow) pairs describing how each node moved.
+ */
+[[nodiscard]] QList<QPair<int, int>>
+sortWithCustomZonesLast(InnerDecklistNode *root, InnerDecklistNode *node, Qt::SortOrder order);
+
+} // namespace DeckListModelCustomZones
+
+#endif // DECK_LIST_MODEL_CUSTOM_ZONES_H

tests/CMakeLists.txt

@@ -114,6 +114,7 @@ target_link_libraries(
 
 add_subdirectory(card_zone_algorithms)
 add_subdirectory(carddatabase)
+add_subdirectory(deck_list_model)
 add_subdirectory(deck_list_zones)
 add_subdirectory(loading_from_clipboard)
 add_subdirectory(movecard_tests)

tests/deck_list_model/CMakeLists.txt

@@ -0,0 +1,33 @@
+add_executable(deck_list_model_custom_zones_test deck_list_model_custom_zones_test.cpp)
+
+if(NOT GTEST_FOUND)
+  add_dependencies(deck_list_model_custom_zones_test gtest)
+endif()
+
+target_link_libraries(
+  deck_list_model_custom_zones_test
+  libcockatrice_models
+  libcockatrice_card
+  libcockatrice_deck_list
+  Threads::Threads
+  ${GTEST_BOTH_LIBRARIES}
+  ${TEST_QT_MODULES}
+)
+add_test(NAME deck_list_model_custom_zones_test COMMAND deck_list_model_custom_zones_test)
+
+add_executable(deck_list_model_zone_integration_test ${VERSION_STRING_CPP} deck_list_model_zone_integration_test.cpp)
+
+if(NOT GTEST_FOUND)
+  add_dependencies(deck_list_model_zone_integration_test gtest)
+endif()
+
+target_link_libraries(
+  deck_list_model_zone_integration_test
+  libcockatrice_models
+  libcockatrice_card
+  libcockatrice_deck_list
+  Threads::Threads
+  ${GTEST_BOTH_LIBRARIES}
+  ${TEST_QT_MODULES}
+)
+add_test(NAME deck_list_model_zone_integration_test COMMAND deck_list_model_zone_integration_test)

tests/deck_list_model/deck_list_model_custom_zones_test.cpp

@@ -0,0 +1,225 @@
+/**
+ * @file deck_list_model_custom_zones_test.cpp
+ * @brief Tests for the deck list model's custom-zone shadow-tree helpers.
+ *
+ * DeckListModelCustomZones centralizes every "what is / where is a custom zone"
+ * decision for the model's shadow tree: type testing, mirroring from the deck
+ * tree, name lookup, and the sort-with-custom-zones-last ordering. These tests
+ * exercise that logic directly on hand-built shadow trees, independent of the
+ * full model and card database machinery.
+ */
+
+#include <gtest/gtest.h>
+#include <libcockatrice/deck_list/tree/deck_list_card_node.h>
+#include <libcockatrice/deck_list/tree/inner_deck_list_node.h>
+#include <libcockatrice/models/deck_list/deck_list_model.h>
+
+namespace
+{
+
+DecklistModelCardNode *cardNode(InnerDecklistNode *parent, const QString &name, int number)
+{
+    // The underlying data node is detached; only the model wrapper is attached to the shadow tree.
+    auto *data = new DecklistCardNode(name, number, nullptr);
+    return new DecklistModelCardNode(data, parent);
+}
+
+QStringList childNames(const InnerDecklistNode *node)
+{
+    QStringList names;
+    for (int i = 0; i < node->size(); ++i) {
+        names.append(node->at(i)->getName());
+    }
+    return names;
+}
+
+} // namespace
+
+// =====================================================================================================================
+// isCustomZone
+// =====================================================================================================================
+
+TEST(DeckListModelCustomZones, IsCustomZoneDistinguishesZoneFromGroup)
+{
+    InnerDecklistNode root;
+    auto *board = new InnerDecklistNode(DECK_ZONE_MAIN, &root);
+    auto *group = new InnerDecklistNode("Creature", board);
+    auto *zone = new DecklistModelSubZoneNode("Removal", board);
+
+    auto *card = cardNode(group, "A", 1);
+
+    EXPECT_FALSE(DeckListModelCustomZones::isCustomZone(board));
+    EXPECT_FALSE(DeckListModelCustomZones::isCustomZone(group));
+    EXPECT_FALSE(DeckListModelCustomZones::isCustomZone(card));
+    EXPECT_TRUE(DeckListModelCustomZones::isCustomZone(zone));
+}
+
+// =====================================================================================================================
+// findSubZoneByName
+// =====================================================================================================================
+
+TEST(DeckListModelCustomZones, FindSubZoneByNameFindsAcrossBoards)
+{
+    InnerDecklistNode root;
+    auto *main = new InnerDecklistNode(DECK_ZONE_MAIN, &root);
+    auto *side = new InnerDecklistNode(DECK_ZONE_SIDE, &root);
+    new DecklistModelSubZoneNode("Removal", main);
+    new DecklistModelSubZoneNode("Utility", side);
+    new InnerDecklistNode("Plain", main); // not a custom zone
+
+    auto *removal = DeckListModelCustomZones::findSubZoneByName(&root, "Removal");
+    ASSERT_NE(removal, nullptr);
+    EXPECT_EQ(removal->getName(), QString("Removal"));
+
+    auto *utility = DeckListModelCustomZones::findSubZoneByName(&root, "Utility");
+    ASSERT_NE(utility, nullptr);
+    EXPECT_EQ(utility->getName(), QString("Utility"));
+
+    // Names are deck-unique; a plain group or built-in board is not matched.
+    EXPECT_EQ(DeckListModelCustomZones::findSubZoneByName(&root, "Plain"), nullptr);
+    EXPECT_EQ(DeckListModelCustomZones::findSubZoneByName(&root, DECK_ZONE_MAIN), nullptr);
+    EXPECT_EQ(DeckListModelCustomZones::findSubZoneByName(&root, "Missing"), nullptr);
+}
+
+// =====================================================================================================================
+// mirrorCustomZones
+// =====================================================================================================================
+
+TEST(DeckListModelCustomZones, MirrorCustomZonesCopiesCardsFlat)
+{
+    // Deck-tree board zone: one direct card plus one nested custom zone.
+    auto *deckBoard = new InnerDecklistNode(DECK_ZONE_MAIN);
+    new DecklistCardNode("Direct", 2, deckBoard);
+
+    auto *deckZone = new InnerDecklistNode("Removal", deckBoard);
+    auto *deckCard1 = new DecklistCardNode("Bolt", 3, deckZone);
+    auto *deckCard2 = new DecklistCardNode("Swords", 1, deckZone);
+
+    InnerDecklistNode shadowRoot;
+    auto *shadowBoard = new InnerDecklistNode(DECK_ZONE_MAIN, &shadowRoot);
+
+    DeckListModelCustomZones::mirrorCustomZones(deckBoard, shadowBoard);
+
+    // Only the custom zone is mirrored as a sub-zone; the direct card is not.
+    ASSERT_EQ(shadowBoard->size(), 1);
+    auto *shadowZone = dynamic_cast<DecklistModelSubZoneNode *>(shadowBoard->at(0));
+    ASSERT_NE(shadowZone, nullptr);
+    EXPECT_EQ(shadowZone->getName(), QString("Removal"));
+
+    // Cards live flat (un-grouped) inside the mirrored zone, wrapping the same data nodes.
+    ASSERT_EQ(shadowZone->size(), 2);
+    auto *shadowCard1 = dynamic_cast<DecklistModelCardNode *>(shadowZone->at(0));
+    auto *shadowCard2 = dynamic_cast<DecklistModelCardNode *>(shadowZone->at(1));
+    ASSERT_NE(shadowCard1, nullptr);
+    ASSERT_NE(shadowCard2, nullptr);
+    EXPECT_EQ(shadowCard1->getDataNode(), deckCard1);
+    EXPECT_EQ(shadowCard2->getDataNode(), deckCard2);
+}
+
+TEST(DeckListModelCustomZones, MirrorCustomZonesWithNoCustomZonesIsNoop)
+{
+    // A board zone with only direct cards has nothing to mirror.
+    auto *deckBoard = new InnerDecklistNode(DECK_ZONE_MAIN);
+    new DecklistCardNode("Direct", 2, deckBoard);
+
+    InnerDecklistNode shadowRoot;
+    auto *shadowBoard = new InnerDecklistNode(DECK_ZONE_MAIN, &shadowRoot);
+
+    DeckListModelCustomZones::mirrorCustomZones(deckBoard, shadowBoard);
+    EXPECT_EQ(shadowBoard->size(), 0);
+}
+
+// =====================================================================================================================
+// sortWithCustomZonesLast
+// =====================================================================================================================
+
+TEST(DeckListModelCustomZones, SortBoardKeepsCustomZonesAfterGroupsAscending)
+{
+    InnerDecklistNode root;
+    auto *board = new InnerDecklistNode(DECK_ZONE_MAIN, &root);
+    new DecklistModelSubZoneNode("Zebra", board);
+    new InnerDecklistNode("Creature", board);
+    new InnerDecklistNode("Instant", board);
+    new DecklistModelSubZoneNode("Alpha", board);
+
+    root.setSortMethod(DeckSortMethod::ByName);
+
+    auto mapping = DeckListModelCustomZones::sortWithCustomZonesLast(&root, board, Qt::AscendingOrder);
+
+    // Groups sort first (by name), then custom zones (by name), always after groups.
+    EXPECT_EQ(childNames(board), (QStringList{"Creature", "Instant", "Alpha", "Zebra"}));
+
+    // Some non-identity movement occurred.
+    EXPECT_FALSE(mapping.isEmpty());
+}
+
+TEST(DeckListModelCustomZones, SortBoardKeepsCustomZonesAfterGroupsDescending)
+{
+    InnerDecklistNode root;
+    auto *board = new InnerDecklistNode(DECK_ZONE_MAIN, &root);
+    new DecklistModelSubZoneNode("Zebra", board);
+    new InnerDecklistNode("Creature", board);
+    new InnerDecklistNode("Instant", board);
+    new DecklistModelSubZoneNode("Alpha", board);
+
+    root.setSortMethod(DeckSortMethod::ByName);
+
+    (void)DeckListModelCustomZones::sortWithCustomZonesLast(&root, board, Qt::DescendingOrder);
+
+    // Groups still lead (descending), custom zones still last.
+    EXPECT_EQ(childNames(board), (QStringList{"Instant", "Creature", "Zebra", "Alpha"}));
+}
+
+TEST(DeckListModelCustomZones, SortBoardMappingIsConsistent)
+{
+    InnerDecklistNode root;
+    auto *board = new InnerDecklistNode(DECK_ZONE_MAIN, &root);
+
+    QList<AbstractDecklistNode *> originalOrder;
+    auto *g0 = new InnerDecklistNode("Creature", board);
+    originalOrder.append(g0);
+    auto *z0 = new DecklistModelSubZoneNode("Zebra", board);
+    originalOrder.append(z0);
+    auto *g1 = new InnerDecklistNode("Instant", board);
+    originalOrder.append(g1);
+    auto *z1 = new DecklistModelSubZoneNode("Alpha", board);
+    originalOrder.append(z1);
+
+    root.setSortMethod(DeckSortMethod::ByName);
+
+    auto mapping = DeckListModelCustomZones::sortWithCustomZonesLast(&root, board, Qt::AscendingOrder);
+
+    // The mapping reports, for each final row, the original row of the node now sitting there.
+    ASSERT_EQ(mapping.size(), board->size());
+    for (const auto &move : mapping) {
+        const int preSortRow = move.first;
+        const int finalRow = move.second;
+        ASSERT_GE(preSortRow, 0);
+        ASSERT_LT(preSortRow, originalOrder.size());
+        EXPECT_EQ(board->at(finalRow), originalOrder[preSortRow]) << "row " << finalRow;
+    }
+
+    // Final order sanity: groups first in name order, then custom zones.
+    EXPECT_EQ(childNames(board), (QStringList{"Creature", "Instant", "Alpha", "Zebra"}));
+}
+
+TEST(DeckListModelCustomZones, SortPlainNodeDoesNotReorderCustomZones)
+{
+    // A non-board node (e.g. a group whose children are cards) is sorted plainly;
+    // custom zones are not a special case there. Cards sort by name.
+    InnerDecklistNode root;
+    auto *board = new InnerDecklistNode(DECK_ZONE_MAIN, &root);
+    auto *group = new InnerDecklistNode("Creature", board);
+    cardNode(group, "Swords", 1);
+    cardNode(group, "Bolt", 3);
+
+    root.setSortMethod(DeckSortMethod::ByName);
+
+    auto mapping = DeckListModelCustomZones::sortWithCustomZonesLast(&root, group, Qt::AscendingOrder);
+    EXPECT_EQ(childNames(group), (QStringList{"Bolt", "Swords"}));
+    ASSERT_EQ(mapping.size(), 2);
+    EXPECT_EQ(mapping[0].first, 1); // "Bolt" was originally at row 1
+    EXPECT_EQ(mapping[0].second, 0);
+    EXPECT_EQ(mapping[1].first, 0);
+    EXPECT_EQ(mapping[1].second, 1);
+}

tests/deck_list_model/deck_list_model_zone_integration_test.cpp

@@ -0,0 +1,71 @@
+#include <gtest/gtest.h>
+#include <libcockatrice/deck_list/deck_list.h>
+#include <libcockatrice/deck_list/deck_list_node_tree.h>
+#include <libcockatrice/deck_list/tree/deck_list_card_node.h>
+#include <libcockatrice/deck_list/tree/inner_deck_list_node.h>
+#include <libcockatrice/models/deck_list/deck_list_model.h>
+
+namespace
+{
+
+int totalCustomZoneRows(const DeckListModel &model)
+{
+    int count = 0;
+    const int rootRows = model.rowCount(QModelIndex());
+    for (int r = 0; r < rootRows; ++r) {
+        const QModelIndex board = model.index(r, 0, QModelIndex());
+        const int childRows = model.rowCount(board);
+        for (int c = 0; c < childRows; ++c) {
+            const QModelIndex child = model.index(c, 0, board);
+            if (child.data(DeckRoles::IsCustomZoneRole).toBool()) {
+                ++count;
+            }
+        }
+    }
+    return count;
+}
+
+} // namespace
+
+// The "Add to Zone" combobox/submenu lists getCustomZoneNames(), which reads the
+// deck tree. These verify the source data a freshly-created zone populates.
+
+TEST(DeckListModelZoneIntegration, CreateZoneThenReadCustomZoneNames)
+{
+    QSharedPointer<DeckList> deck(new DeckList());
+    DeckListModel model(nullptr, deck);
+    auto *tree = deck->getTree();
+
+    ASSERT_NE(tree->addCustomZone(DECK_ZONE_MAIN, "Removal"), nullptr);
+    EXPECT_EQ(model.getCustomZoneNames(DECK_ZONE_MAIN), (QStringList{"Removal"}));
+}
+
+TEST(DeckListModelZoneIntegration, CreateTwoZonesThenReadBoth)
+{
+    QSharedPointer<DeckList> deck(new DeckList());
+    DeckListModel model(nullptr, deck);
+    auto *tree = deck->getTree();
+
+    ASSERT_NE(tree->addCustomZone(DECK_ZONE_MAIN, "Removal"), nullptr);
+    ASSERT_NE(tree->addCustomZone(DECK_ZONE_MAIN, "Utility"), nullptr);
+    EXPECT_EQ(model.getCustomZoneNames(DECK_ZONE_MAIN), (QStringList{"Removal", "Utility"}));
+}
+
+// Mirroring regression: rebuildTree must mirror each custom zone exactly once.
+TEST(DeckListModelZoneIntegration, RebuildTreeMirrorsEachZoneOnce)
+{
+    QSharedPointer<DeckList> deck(new DeckList());
+    DeckListModel model(nullptr, deck);
+    auto *tree = deck->getTree();
+
+    // One direct mainboard card plus two nested custom zones.
+    tree->addCard("Lightning Bolt", 2, DECK_ZONE_MAIN, -1);
+    ASSERT_NE(tree->addCustomZone(DECK_ZONE_MAIN, "Removal"), nullptr);
+    tree->addCard("Swords to Plowshares", 1, "Removal", -1);
+    ASSERT_NE(tree->addCustomZone(DECK_ZONE_MAIN, "Utility"), nullptr);
+
+    model.rebuildTree();
+
+    EXPECT_EQ(model.getCustomZoneNames(DECK_ZONE_MAIN), (QStringList{"Removal", "Utility"}));
+    EXPECT_EQ(totalCustomZoneRows(model), 2);
+}