Elsath, The World Eater

+1: Sacrifice target permanent you control, you gain life equal to it's power and draw cards equal to it's toughness. You have no maximum hand size.
-2: Search your library for an Eldrazi spell and place it into your hand, then create X 0/1 Eldrazi Spawn creature tokens where X is the spell's cost
-12: Each opponent loses 12 life, discards 12 cards, sacrifices 12 non-land permanents, and exiles the top 12 cards of their library