Durvod, Simic Researcher

Landfall —Investigate. (Create a colorless artifact
Clue token with "{2} Sacrifice this artifact: Draw a
card.")
Sacrifice five Clue tokens: You gain an emblem
with "Non-Human creatures in your hand and
deck have Mutate {x} (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 under it. X is the card's mana
cost minus {1}.)