Soma, Expirienced Alchemist

{g/u}{g/u}{g/u}{g/u}, {t}: Cast a non-Human creature card
from your hand onto another non-Human
creature as if you had paid a Mutate cost.
(If you cast a 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.)
Whenever you mutate a creature you control,
scry 1, then draw a card.