Massacre Wurm is a mythic Creature — Phyrexian Wurm card from Core Set 2021 Promos (PM21), collector number 114p. Current market price: $6.55 (foil $12.74), TCGplayer market prices via Scryfall.
When this creature enters, creatures your opponents control get -2/-2 until end of turn. Whenever a creature an opponent controls dies, that player loses 2 life.