Billy, Savior of Ravnica

+1: Draw a card and gain life equal to the number of zombies on the battlefield.
-4: Lose 4 life. Draw 4 cards. Add 4 mana of any color to your mana pool. Destroy target creature. Create 4 1/1 black & white knight creature tokens.
-10: Destroy target planeswalker. Gain 5 life. Create a 10/10 legendary creature token named "Spirit of Bolas" with flying and indestructible.