Butterfree

Mutate {w}{g}(If you cast this spell for its mutate
cost,put it over or under target non-Human
creature youown. They mutate into the creature
on top plus allabilities from under it.)
———{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}
Flying
Whenever this creature mutates, if it mutated
onto Metapod, put a hexproof counter on it and
you gain 3 life.