Knight of New Alara

Flying Whenever a source an opponent controls deals damage to you, you may put that many +1/+1 counters on this creature.

Flying At the beginning of each upkeep, create a 1/1 red and green Dragon creature token with flying and devour 2. (As the token enters, you may sacrifice any number of creatures. It enters with twice that many +1/+1 counters on it.)