Kazan, Demon's Fury

+3: Discard three cards or put the top three cards of your library into your graveyard. Each opponent must do the same.
-3: Target player loses three life, discards three cards, then puts the top three cards of their library into their graveyard.
-13: Exile all graveyards. Kazan becomes an X/X legendary Demon creature with Intimidate, where X is the number of cards exiled with it.