Flying Jelly-Tree

Mutate {2}{g}{w}{u} (If you cast this spell for its
mutatecost, put it over or under target non-Human
creatureyou own. They mutate into the creature on
top plus all abilities from under it.)
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{t}: Add {g}, {w}, or {u} to your mana pool.
Whenever this creature mutates, put a flying
counter on target creature you control.