Salliel, Apex of Unity

Mutate {2}{g/u}{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, Vigilance, Lifelink
Whenever this creature mutates, put a +1/+1
counter and a vigilance counter on each creature
you control.