Argentum Masticore is a rare Artifact Creature — Phyrexian Masticore card from Phyrexia: All Will Be One Promos (PONE), collector number 222p. Current market price: $0.40 (foil $1.82), TCGplayer market prices via Scryfall.
First strike, protection from multicolored At the beginning of your upkeep, sacrifice this creature unless you discard a card. When you discard a card this way, destroy target nonland permanent an opponent controls with mana value less than or equal to the mana value of the discarded card.