Squirrel Overlord Macbeth

+6: Destroy all creatures you control, search your library for up to 3 cards, put two on top of your library and the other into your hand.
-4: All creatures in all graveyards are shuffled into their controllers library. Each opponent mills 10 cards. You draw 1 card for each opponent.
-12: Target player loses the game, another target opponent loses half their life total rounded down. You gain life equal to life lost this turn.