Quagomire, the Northern Blaze

Mutate {r}{r} (If you cast this spell for its mutate
cost, put it over or under target non-Human creature
you own. They mutate onto the creature on top plus
all abilities from under it.)
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When this creature leaves the battlefield, it deals
damage equal to its power to target creature an
opponent controls. Then, return all creatures
mutated over it to the battlefield under their
owners control.