Xelo, Mutant of the Mire

Mutate {4}{g/u}{g/w}{w/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.)
Hexproof, trample
{g/u}{g/w}: Put a +1/+1 counter on Xelo, Mutant of
the Mire.