Baloth of the Skies

Mutate {1}{g}{g/w}{w} (If you cast this spell for its
mutate cost, put it over or under target non-Human
creature you own. They mutate into the creature on
top plus all abilities from under it.)
Flying, trample
Whenever this creature mutates, put a +1/+1
counter on each of up to two target creatures you control.