Koba, Tyrant of the Canopy

{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 Koba, Tyrant of the Canopy attacks, defending player sacrifices an artifact.