King Julian

{t}: Each player creates a colorless artifact token named Banana with "{t}, Sacrifice this artifact: Add {r} or {g}. You gain 2 life.".
Whenever an artifact an opponent controls is put into a graveyard from the battlefield, put a +1/+1 counter on each creature you control that's an Ape or a Monkey.
Whenever King Julian attacks, defending player sacrifices an artifact.