Whenever Kaalia of the Vast attacks an opponent, you may put an Angel, Demon, or Dragon creature card from your hand onto the battlefield tapped and attacking that opponent.
9/22/2011 Kaalia’s ability doesn’t trigger if it attacks a planeswalker.
9/22/2011 The creature card is already tapped and attacking as it’s put onto the battlefield. Any abilities that trigger when a creature becomes tapped or when a creature attacks won’t trigger for that card.
9/22/2011 If the opponent Kaalia attacked is no longer in the game when its ability resolves, you may put an Angel, Demon, or Dragon creature card onto the battlefield tapped, but it won’t be attacking anyone and it won’t be an attacking creature.