diff --git a/Mage/src/main/java/mage/cards/decks/DeckValidator.java b/Mage/src/main/java/mage/cards/decks/DeckValidator.java
index fccc650698c..d99452da9ad 100644
--- a/Mage/src/main/java/mage/cards/decks/DeckValidator.java
+++ b/Mage/src/main/java/mage/cards/decks/DeckValidator.java
@@ -34,6 +34,7 @@ public abstract class DeckValidator implements Serializable {
         maxCopiesMap.put("Persistent Petitioners", Integer.MAX_VALUE);
         maxCopiesMap.put("Dragon's Approach", Integer.MAX_VALUE);
         maxCopiesMap.put("Slime Against Humanity", Integer.MAX_VALUE);
+        maxCopiesMap.put("Once More with Feeling", 1);
         maxCopiesMap.put("Seven Dwarves", 7);
         maxCopiesMap.put("Nazgul", 9);
     }