Kazan, Demon's Fury

0: Kazan, Demon's Fury becomes a Legendary Demon creature with power and toughness equal to the number of loyalty counters on it.
+3: Kazan, Demon's Fury deals three damage to any target. It's controller discards a card from their hand or mills one card.
-13: Kazan, Demon's fury becomes an X/X Demon creature with Hexproof, where X is the number of creatures in each player's graveyard.