Yenhe, Bringer of Change

Mutate {1}{g}{r}{u} (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.)
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Creatures spells you control have flash and
mutate. It's mutate cost is equal to it's converted
mana cost plus {2}.
"Embrace it or not, change comes for us all."