Arokria, Demon Master

+3: Deal 5 damage to target creature or planeswalker, you gain 5 life.
-5: You gain X life and draw X cards, where X is the number of creatures you control.
-15: Deal 15 damage to each nonland permanent. Sacrifice Arokria, Demon Master. You get a 9/9 black and white demon token with lifelink.