Aurieus, Breaker of Kings

0: Until your next turn, whenever an opponent casts a spell, add a loyalty counter to Aurieus, Breaker of Kings.
-4: Until your next turn, Aurieus Breaker of Kings becomes a 5/5 Angel with Flying and First Strike, and Lifelink that is still a Planeswalker.
-X: Destroy each nonland permanent with converted mana cost X or less, they can't be regenerated. Aurieus deals X to each opponent