Kazan, Demon's Fury

+2: Discard three cards and/or put the top three cards of your library into your graveyard.
-2: Target opponent loses three life, discards three cards, then puts the top three cards of their library into their graveyard.
-10: Exile all graveyards. Kazan becomes an X/X legendary Demon creature with Intimidate, where X is the number of cards exiled with it.