Hulking Metamorph is a uncommon Artifact Creature — Shapeshifter card from The Brothers' War (BRO), collector number 79. Current market price: $0.21 (foil $0.32), TCGplayer market prices via Scryfall.
Prototype {2}{U}{U} — 3/3 (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.) You may have this creature enter as a copy of an artifact or creature you control, except it's an artifact creature in addition to its other types, and its power and toughness are equal to this creature's power and toughness.