diff --git a/client/src/components/cards.js b/client/src/components/cards.js
index 740df99..ff5e2d8 100644
--- a/client/src/components/cards.js
+++ b/client/src/components/cards.js
@@ -587,7 +587,7 @@ async function quickAddCard(cardId, deckId) {
   }
 }
 
-export async function showCardDetail(cardId) {
+export async function showCardDetail(cardId, printingId = null) {
   try {
     showLoading();
     const [cardResult, ownershipResult] = await Promise.all([
@@ -596,7 +596,11 @@ export async function showCardDetail(cardId) {
     ]);
     const card = cardResult.card;
     const ownership = ownershipResult;
-    const firstPrinting = card.printings && card.printings.length > 0 ? card.printings[0] : null;
+    const firstPrinting = card.printings && card.printings.length > 0
+      ? (printingId !== null
+          ? (card.printings.find(p => p.id == printingId) || card.printings[0])
+          : card.printings[0])
+      : null;
     hideLoading();
 
     // Parse type line to extract supertypes, types, and subtypes
@@ -1461,16 +1465,13 @@ async function showSwapPrintingModal(card, fromPrintingId, quantity, cardId, own
 
       try {
         showLoading();
-        // Remove from old printing
-        await api.setOwnedPrintingQuantity(fromPrintingId, 0);
-        // Add to new printing (will add to existing if already owned)
-        const existingOwned = ownership.ownedPrintings.find(op => op.printing_id === toPrintingId);
-        const newQuantity = (existingOwned ? existingOwned.quantity : 0) + quantity;
-        await api.setOwnedPrintingQuantity(toPrintingId, newQuantity);
+        // Move inventory and matching deck usage together in one transaction.
+        await api.swapOwnedPrinting(fromPrintingId, toPrintingId);
 
         showToast('Printing changed!', 'success', 2000);
-        // Reload card detail
-        await showCardDetail(cardId);
+        window.dispatchEvent(new CustomEvent('inventory:refresh'));
+        // Reload card detail using the newly selected printing
+        await showCardDetail(cardId, toPrintingId);
         hideLoading();
       } catch (error) {
         hideLoading();
diff --git a/client/src/components/deckBuilder.js b/client/src/components/deckBuilder.js
index c1595b0..89cc59e 100644
--- a/client/src/components/deckBuilder.js
+++ b/client/src/components/deckBuilder.js
@@ -1738,7 +1738,7 @@ async function showCardModal(printingId) {
   try {
     const card = currentDeck.cards.find(c => c.printing_id == printingId);
     if (card && card.card_id) {
-      await showCardDetail(card.card_id);
+      await showCardDetail(card.card_id, card.printing_id);
     } else {
       console.error('Card not found or missing card_id:', { printingId, card, currentDeck: currentDeck?.cards?.length });
       showToast('Card details not available', 'warning');
@@ -2476,8 +2476,9 @@ function renderExampleHand() {
     // Click to show modal
     cardEl.addEventListener('click', async () => {
       const cardId = cardEl.dataset.cardId;
+      const printingId = cardEl.dataset.printingId;
       if (cardId) {
-        await showCardDetail(cardId);
+        await showCardDetail(cardId, printingId || null);
       }
     });
 
diff --git a/client/src/components/inventory.js b/client/src/components/inventory.js
index 390b2d2..2d5b926 100644
--- a/client/src/components/inventory.js
+++ b/client/src/components/inventory.js
@@ -19,8 +19,9 @@ let selectedCards = new Set(); // Track selected card IDs for multi-select
 let selectMode = false; // Whether multi-select mode is active
 
 export function setupInventory() {
-  // Load inventory data when page is shown
+  // Load inventory data when page is shown or when a printing swap changes ownership.
   window.addEventListener('page:inventory', loadInventoryData);
+  window.addEventListener('inventory:refresh', loadInventoryData);
 
   // Setup filter listeners
   setupFilterListeners();
@@ -887,7 +888,8 @@ function renderGridView(container) {
           cb.innerHTML = `<i class="ph ${selectedCards.has(cardId) ? 'ph-check-square' : 'ph-square'}"></i>`;
         }
       } else {
-        await showCardDetail(cardId);
+        const card = inventoryData.cards.find(c => c.card_id === cardId);
+        await showCardDetail(cardId, card?.selected_printing_id || null);
       }
     });
   });
@@ -960,7 +962,8 @@ function renderListView(container) {
           cb.innerHTML = `<i class="ph ${selectedCards.has(cardId) ? 'ph-check-square' : 'ph-square'}"></i>`;
         }
       } else {
-        await showCardDetail(cardId);
+        const card = inventoryData.cards.find(c => c.card_id === cardId);
+        await showCardDetail(cardId, card?.selected_printing_id || null);
       }
     });
   });
diff --git a/client/src/services/api.js b/client/src/services/api.js
index 01c9324..f112426 100644
--- a/client/src/services/api.js
+++ b/client/src/services/api.js
@@ -142,6 +142,13 @@ class ApiClient {
     });
   }
 
+  async swapOwnedPrinting(fromPrintingId, replacementPrintingId) {
+    return this.request(`/cards/printings/${fromPrintingId}/swap`, {
+      method: 'POST',
+      body: JSON.stringify({ replacementPrintingId }),
+    });
+  }
+
   // Deck methods
   async getDecks() {
     return this.request('/decks');
diff --git a/src/routes/cards.js b/src/routes/cards.js
index 4b82ba4..4e59ccb 100644
--- a/src/routes/cards.js
+++ b/src/routes/cards.js
@@ -14,6 +14,7 @@ import {
   getCardOwnershipStatus,
   getCardOwnedPrintings,
   setOwnedPrintingQuantity,
+  swapOwnedPrinting,
   getCardOwnershipAndUsage,
 } from '../services/cardService.js';
 import { authenticate } from '../middleware/auth.js';
@@ -242,6 +243,26 @@ router.get('/:id/ownership-usage', authenticate, (req, res, next) => {
   }
 });
 
+/**
+ * POST /api/cards/printings/:printingId/swap
+ * Atomically move owned copies to another printing
+ */
+router.post('/printings/:printingId/swap', authenticate, (req, res, next) => {
+  try {
+    const fromPrintingId = parseInt(req.params.printingId);
+    const toPrintingId = parseInt(req.body.replacementPrintingId);
+
+    if (!Number.isInteger(toPrintingId)) {
+      return res.status(400).json({ error: 'replacementPrintingId is required' });
+    }
+
+    const result = swapOwnedPrinting(req.user.id, fromPrintingId, toPrintingId);
+    res.json(result);
+  } catch (error) {
+    next(error);
+  }
+});
+
 /**
  * POST /api/cards/printings/:printingId/quantity
  * Set owned quantity for a specific printing
diff --git a/src/services/cardService.js b/src/services/cardService.js
index de92ff4..b5b5d2a 100644
--- a/src/services/cardService.js
+++ b/src/services/cardService.js
@@ -719,6 +719,123 @@ export function setOwnedPrintingQuantity(userId, printingId, quantity) {
   return { success: true, quantity };
 }
 
+/**
+ * Atomically move all owned copies from one printing to another.
+ * Deck rows that explicitly use the old owned printing move with it.
+ */
+export function swapOwnedPrinting(userId, fromPrintingId, toPrintingId) {
+  if (fromPrintingId === toPrintingId) {
+    throw new Error('Replacement printing must be different');
+  }
+
+  const source = db.get(
+    `SELECT op.id as owned_printing_id, op.quantity, p.card_id
+     FROM owned_printings op
+     JOIN printings p ON op.printing_id = p.id
+     WHERE op.user_id = ? AND op.printing_id = ?`,
+    [userId, fromPrintingId]
+  );
+
+  if (!source) {
+    throw new Error('Owned printing not found');
+  }
+
+  const replacement = db.get(
+    `SELECT card_id FROM printings WHERE id = ?`,
+    [toPrintingId]
+  );
+
+  if (!replacement || replacement.card_id !== source.card_id) {
+    throw new Error('Replacement printing must be for the same card');
+  }
+
+  return db.transaction(() => {
+    const affectedDeckRows = db.all(
+      `SELECT dc.id, dc.deck_id, dc.quantity, dc.is_sideboard, dc.is_commander,
+              COALESCE(dc.board_type, CASE WHEN dc.is_sideboard = 1 THEN 'sideboard' ELSE 'mainboard' END) as board_type
+       FROM deck_cards dc
+       JOIN decks d ON d.id = dc.deck_id
+       WHERE dc.printing_id = ? AND d.user_id = ?`,
+      [fromPrintingId, userId]
+    );
+
+    for (const deckRow of affectedDeckRows) {
+      const existingDeckRow = db.get(
+        `SELECT id, quantity, is_commander,
+                COALESCE(board_type, CASE WHEN is_sideboard = 1 THEN 'sideboard' ELSE 'mainboard' END) as board_type
+         FROM deck_cards
+         WHERE deck_id = ? AND printing_id = ? AND is_sideboard = ?`,
+        [deckRow.deck_id, toPrintingId, deckRow.is_sideboard]
+      );
+
+      if (existingDeckRow) {
+        // Legacy uniqueness is based on is_sideboard. Do not merge two logical
+        // boards (for example mainboard and maybeboard) that share that flag.
+        if (existingDeckRow.board_type !== deckRow.board_type) {
+          continue;
+        }
+
+        db.run(
+          `UPDATE deck_cards
+           SET quantity = ?, is_commander = ?
+           WHERE id = ?`,
+          [
+            existingDeckRow.quantity + deckRow.quantity,
+            existingDeckRow.is_commander || deckRow.is_commander ? 1 : 0,
+            existingDeckRow.id
+          ]
+        );
+        db.run(`DELETE FROM deck_cards WHERE id = ?`, [deckRow.id]);
+      } else {
+        db.run(
+          `UPDATE deck_cards SET printing_id = ? WHERE id = ?`,
+          [toPrintingId, deckRow.id]
+        );
+      }
+    }
+
+    const existingReplacement = db.get(
+      `SELECT id, quantity
+       FROM owned_printings
+       WHERE user_id = ? AND printing_id = ?`,
+      [userId, toPrintingId]
+    );
+
+    if (existingReplacement) {
+      db.run(
+        `UPDATE owned_printings
+         SET quantity = ?, updated_at = CURRENT_TIMESTAMP
+         WHERE id = ?`,
+        [existingReplacement.quantity + source.quantity, existingReplacement.id]
+      );
+    } else {
+      db.run(
+        `INSERT INTO owned_printings (user_id, printing_id, quantity)
+         VALUES (?, ?, ?)`,
+        [userId, toPrintingId, source.quantity]
+      );
+    }
+
+    db.run(
+      `DELETE FROM owned_printings WHERE id = ?`,
+      [source.owned_printing_id]
+    );
+
+    db.run(
+      `INSERT INTO owned_cards (user_id, card_id, quantity) VALUES (?, ?, 1)
+       ON CONFLICT(user_id, card_id) DO UPDATE SET quantity = 1`,
+      [userId, source.card_id]
+    );
+
+    return {
+      success: true,
+      fromPrintingId,
+      toPrintingId,
+      quantity: source.quantity
+    };
+  });
+}
+
 /**
  * Get all decks that contain a specific card
  */
diff --git a/src/services/inventoryService.js b/src/services/inventoryService.js
index dc7795d..1e51268 100644
--- a/src/services/inventoryService.js
+++ b/src/services/inventoryService.js
@@ -17,7 +17,7 @@ export function getInventory(userId, filters = {}) {
   } = filters;
 
   const offset = (page - 1) * limit;
-  const params = [userId];
+  const params = [userId, userId, userId];
   const countParams = [userId];
 
   // Base query - get all owned cards with their details
@@ -30,7 +30,18 @@ export function getInventory(userId, filters = {}) {
       c.colors,
       c.type_line,
       c.oracle_text,
-      (SELECT p.image_url FROM printings p WHERE p.card_id = c.id AND p.image_url IS NOT NULL LIMIT 1) as image_url,
+      (SELECT p.image_url
+       FROM owned_printings op
+       JOIN printings p ON op.printing_id = p.id
+       WHERE op.user_id = ? AND p.card_id = c.id AND p.image_url IS NOT NULL
+       ORDER BY op.quantity DESC, op.id ASC
+       LIMIT 1) as image_url,
+      (SELECT p.id
+       FROM owned_printings op
+       JOIN printings p ON op.printing_id = p.id
+       WHERE op.user_id = ? AND p.card_id = c.id AND p.image_url IS NOT NULL
+       ORDER BY op.quantity DESC, op.id ASC
+       LIMIT 1) as selected_printing_id,
       (
         SELECT COALESCE(SUM(op.quantity), 0)
         FROM owned_printings op