The Burg Anomaly

Mutate {1}{g}{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.)
Creature cards you own have Mutate. Their
Mutate cost is equal to their mana cost reduced
by up to {2}.
Partner (You can have two commanders if both have partner.)