Thanos, The Mad Titan

+1: Look at the top four cards of your library. You may reveal an artifact card from among them and put it in your hand. Then shuffle your library.
0: Until end of turn, Thanos, The Mad Titan, becomes a 6/6 Titan creature with indestructible that's still a planeswalker.
-7: Target player loses half their life, rounded down. Then deal 10 damage to each opponent.