Unctus's Retrofitter is a uncommon Creature — Phyrexian Artificer card from Phyrexia: All Will Be One (ONE), collector number 76. Current market price: $0.19 (foil $0.27), TCGplayer market prices via Scryfall.
Toxic 1 (Players dealt combat damage by this creature also get a poison counter.) When this creature enters, up to one target artifact you control becomes an artifact creature with base power and toughness 4/4 for as long as this creature remains on the battlefield.