Vulpikeet (Ikoria: Lair of Behemoths)

Creature Ñ Fox Bird - Mutate {2}{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
Whenever this creature mutates, put a +1/+1 counter on it.