Ambulatory Edifice is a uncommon Artifact Creature — Phyrexian Construct card from Phyrexia: All Will Be One (ONE), collector number 79. Current market price: $0.07 (foil $0.23), TCGplayer market prices via Scryfall.
When this creature enters, you may pay 2 life. When you do, target creature gets -1/-1 until end of turn.