Add ability to cast

Mage.Sets/src/mage/cards/c/CitadelOfPain.java

@@ -58,6 +58,7 @@ public class CitadelOfPain extends CardImpl {
         TriggeredAbility triggered = new OnEventTriggeredAbility(GameEvent.EventType.END_TURN_STEP_PRE, "beginning of the end step", true,
                 new CitadelOfPainEffect());
         // At the beginning of each player's end step, Citadel of Pain deals X damage to that player, where X is the number of untapped lands he or she controls.
+        this.addAbility(triggered);
     }
 
     public CitadelOfPain(final CitadelOfPain card) {