Add a button on the deck editor to change your cards to the oldest versions.

Mage.Client/src/main/java/mage/client/cards/DragCardGrid.java

@@ -562,6 +562,7 @@ public class DragCardGrid extends JPanel implements DragCardSource, DragCardTarg
     JButton selectByButton;
     JButton analyseButton;
     JButton blingButton;
+    JButton oldVersionButton;
 
     // Popup for toolbar
     final JPopupMenu filterPopup;
@@ -716,6 +717,7 @@ public class DragCardGrid extends JPanel implements DragCardSource, DragCardTarg
         selectByButton = new JButton("Select By");
         analyseButton = new JButton("M"); // "Mana" button
         blingButton = new JButton("B"); // "Bling" button
+        oldVersionButton = new JButton("O"); // "Old version" button
 
         // Name and count label
         deckNameAndCountLabel = new JLabel();
@@ -740,6 +742,7 @@ public class DragCardGrid extends JPanel implements DragCardSource, DragCardTarg
         toolbarInner.add(visibilityButton);
         toolbarInner.add(analyseButton);
         toolbarInner.add(blingButton);
+        toolbarInner.add(oldVersionButton);
         toolbar.add(toolbarInner, BorderLayout.WEST);
         JPanel sliderPanel = new JPanel(new GridBagLayout());
         sliderPanel.setOpaque(false);
@@ -982,6 +985,11 @@ public class DragCardGrid extends JPanel implements DragCardSource, DragCardTarg
 
         blingButton.addActionListener(evt -> blingDeck());
 
+        // Old version button - Switch cards to the oldest non-promo printing. In case of multiples in a set, take the lowest card number.
+        oldVersionButton.setToolTipText("Switch cards to the oldest non-promo printing");
+
+        oldVersionButton.addActionListener(evt -> oldVersionDeck());
+
         // Filter popup
         filterPopup = new JPopupMenu();
         filterPopup.setPreferredSize(new Dimension(300, 300));
@@ -1567,6 +1575,44 @@ public class DragCardGrid extends JPanel implements DragCardSource, DragCardTarg
         }
     }
 
+    private void oldVersionDeck() {
+        if (this.mode != Constants.DeckEditorMode.FREE_BUILDING) {
+            return;
+        }
+
+        if (JOptionPane.showConfirmDialog(null, "Are you sure you want to switch your card versions to the oldest ones?", "WARNING",
+                JOptionPane.YES_NO_OPTION) != JOptionPane.YES_OPTION) {
+            return;
+        }
+
+        List<List<List<CardView>>> newCardGrid = new ArrayList<>();
+        for (List<List<CardView>> gridRow : cardGrid) {
+            List<List<CardView>> newGridRow = new ArrayList<>();
+            for (List<CardView> stack : gridRow) {
+                List<CardView> newStack = new ArrayList<>();
+                for (CardView card : stack) {
+                    CardInfo oldestCardInfo = CardRepository.instance.findOldestNonPromoVersionCard(card.getName());
+                    if (oldestCardInfo != null) {
+                        CardView oldestCardView = new CardView(oldestCardInfo.getMockCard());
+                        this.removeCardView(card);
+                        eventSource.fireEvent(card, ClientEventType.REMOVE_SPECIFIC_CARD);
+                        this.addCardView(oldestCardView, false);
+                        eventSource.fireEvent(oldestCardView, ClientEventType.ADD_SPECIFIC_CARD);
+                        newStack.add(oldestCardView);
+                    } else {
+                        newStack.add(card);
+                    }
+                }
+                newGridRow.add(newStack);
+            }
+            newCardGrid.add(newGridRow);
+        }
+        cardGrid = newCardGrid;
+        layoutGrid();
+        cardScroll.revalidate();
+        repaint();
+    }
+
     // Update the contents of the card grid
     public void setCards(CardsView cardsView, DeckCardLayout layout, BigCard bigCard) {
         if (bigCard != null) {

Mage/src/main/java/mage/cards/repository/CardRepository.java

@@ -12,6 +12,7 @@ import com.j256.ormlite.support.DatabaseConnection;
 import com.j256.ormlite.table.TableUtils;
 import mage.cards.CardSetInfo;
 import mage.constants.CardType;
+import mage.constants.SetType;
 import mage.constants.SuperType;
 import mage.game.events.Listener;
 import mage.util.RandomUtil;
@@ -485,6 +486,37 @@ public enum CardRepository {
         return Collections.emptyList();
     }
 
+    public CardInfo findOldestNonPromoVersionCard(String name) {
+        List<CardInfo> allVersions = this.findCards(name);
+        if (!allVersions.isEmpty()) {
+            allVersions.sort(new OldestNonPromoComparator());
+            return allVersions.get(0);
+        } else {
+            return null;
+        }
+    }
+
+    static class OldestNonPromoComparator implements Comparator<CardInfo> {
+        @Override
+        public int compare(CardInfo a, CardInfo b) {
+            ExpansionInfo aSet = ExpansionRepository.instance.getSetByCode(a.getSetCode());
+            ExpansionInfo bSet = ExpansionRepository.instance.getSetByCode(b.getSetCode());
+            if (aSet.getType() == SetType.PROMOTIONAL && bSet.getType() != SetType.PROMOTIONAL) {
+                return 1;
+            }
+            if (bSet.getType() == SetType.PROMOTIONAL && aSet.getType() != SetType.PROMOTIONAL) {
+                return -1;
+            }
+            if (aSet.getReleaseDate().after(bSet.getReleaseDate())) {
+                return 1;
+            }
+            if (aSet.getReleaseDate().before(bSet.getReleaseDate())) {
+                return -1;
+            }
+            return Integer.compare(a.getCardNumberAsInt(), b.getCardNumberAsInt());
+        }
+    }
+
     public long getContentVersionFromDB() {
         try {
             ConnectionSource connectionSource = new JdbcConnectionSource(JDBC_URL);