Metapod

Mutate {g}(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.)
———{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}
Defender
If metapod has mutated, it can attack as though
it didn't have defender.
Metapod gets +0/+2. If it has mutated
onto Caterpie, it gets +0/+4 instead.