Antros, Shadow Warrior

-2: Destroy target non-black creature. As long as Antros, Shodow Warrior remains on the battlefield, no player can win the game.
-3: Destroy target creature or artifact. It can't be regenerated.
-6: Target player loses half of his life total (rounded up). Destroy up to four target permanents. After using this the second time, flip Antros.