diff --git a/src/components.tsx b/src/components.tsx
index 054621d..1ba0f14 100644
--- a/src/components.tsx
+++ b/src/components.tsx
@@ -98,6 +98,15 @@ const ICON_UPLOAD = icon(
     <path d="M4 18v1a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2v-1" />
   </>,
 );
+// A box (as on the "Not owned" filter) with a plus: add to the library.
+const ICON_LIBRARY_ADD = icon(
+  <>
+    <path d="M20 11V8l-8-4.5L4 8v8l8 4.5" />
+    <path d="M4 8l8 4.5L20 8" />
+    <path d="M12 12.5v8" />
+    <path d="M18 14v7M14.5 17.5h7" />
+  </>,
+);
 
 /**
  * A small round icon-only button, used consistently for lightweight actions
@@ -146,6 +155,7 @@ export const Icons = {
   cards: ICON_CARDS,
   download: ICON_DOWNLOAD,
   upload: ICON_UPLOAD,
+  libraryAdd: ICON_LIBRARY_ADD,
 };
 
 // --- Dialogs ------------------------------------------------------------
diff --git a/src/views/DeckView.tsx b/src/views/DeckView.tsx
index e4a107a..7096425 100644
--- a/src/views/DeckView.tsx
+++ b/src/views/DeckView.tsx
@@ -55,6 +55,14 @@ function useMediaQuery(query: string) {
 }
 
 /** Tooltip/label + icon for the per-card mainboard/maybeboard toggle. */
+/** Copies of a deck card you'd need to acquire to cover the deck. */
+const shortBy = (e: DeckEntry) => Math.max(0, e.quantity - e.quantity_owned);
+
+function libraryAddLabel(e: DeckEntry): string {
+  const n = shortBy(e);
+  return n === 1 ? "Add to library" : `Add ${n} copies to library`;
+}
+
 function boardToggleProps(e: DeckEntry) {
   return e.is_maybeboard
     ? { icon: Icons.arrowLeftCircle, label: "Move to deck" }
@@ -763,6 +771,23 @@ export function DeckView({ refreshSignal }: { refreshSignal?: number }) {
     }
   }
 
+  /** Record cards as owned: as many copies as the deck uses beyond those
+   * already owned, so an acquired card moves to "In your library". */
+  async function addToLibrary(entries: DeckEntry[]) {
+    await Promise.all(entries.filter((e) => shortBy(e) > 0).map((e) => api.addOwned(e.oracle_id, shortBy(e))));
+    await loadContents();
+  }
+
+  async function bulkAddToLibrary() {
+    setBulkBusy(true);
+    try {
+      await addToLibrary(contents.filter((e) => selectedCards.has(e.oracle_id)));
+      setSelectedCards(new Set());
+    } finally {
+      setBulkBusy(false);
+    }
+  }
+
   async function confirmDelete() {
     if (dialog?.kind !== "delete") return;
     await api.deleteDeck(dialog.deck.id);
@@ -904,7 +929,17 @@ export function DeckView({ refreshSignal }: { refreshSignal?: number }) {
               />
             }
             cornerBottomLeft={
-              <IconButton overlay {...boardToggleProps(e)} onClick={() => setMaybeboard(e, !e.is_maybeboard)} />
+              <span className="row" style={{ gap: 4 }}>
+                <IconButton overlay {...boardToggleProps(e)} onClick={() => setMaybeboard(e, !e.is_maybeboard)} />
+                {e.quantity_owned === 0 && (
+                  <IconButton
+                    overlay
+                    icon={Icons.libraryAdd}
+                    label={libraryAddLabel(e)}
+                    onClick={() => addToLibrary([e])}
+                  />
+                )}
+              </span>
             }
             footer={e.is_commander ? <span className="tile-badge">★ commander</span> : undefined}
           />
@@ -960,7 +995,12 @@ export function DeckView({ refreshSignal }: { refreshSignal?: number }) {
               </td>
               <td data-label="Owned">{e.quantity_owned}</td>
               <td>
-                <IconButton {...boardToggleProps(e)} onClick={() => setMaybeboard(e, !e.is_maybeboard)} />
+                <span className="row" style={{ gap: 4 }}>
+                  <IconButton {...boardToggleProps(e)} onClick={() => setMaybeboard(e, !e.is_maybeboard)} />
+                  {e.quantity_owned === 0 && (
+                    <IconButton icon={Icons.libraryAdd} label={libraryAddLabel(e)} onClick={() => addToLibrary([e])} />
+                  )}
+                </span>
               </td>
             </tr>
           ))}
@@ -1264,6 +1304,13 @@ export function DeckView({ refreshSignal }: { refreshSignal?: number }) {
                   <button className="danger" onClick={bulkRemoveFromDeck} disabled={bulkBusy}>
                     Remove from deck
                   </button>
+                  <button
+                    onClick={bulkAddToLibrary}
+                    disabled={bulkBusy || !contents.some((e) => selectedCards.has(e.oracle_id) && shortBy(e) > 0)}
+                    title="Add the copies these cards are missing to your library"
+                  >
+                    Add to library
+                  </button>
                 </div>
                 <span className="spacer" />
                 <button onClick={() => setSelectedCards(new Set())} disabled={bulkBusy}>