Nethroi, Apex of Death

Mutate {4}{g/w}{b}{b} (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.)

Deathtouch, lifelink

Whenever this creature mutates, return any
number of target creature cards with total
power 10 or less from your graveyard to the
battlefield.