Mephitic Ooze is a rare Creature — Ooze card from Darksteel (DST), collector number 47. Current market price: $0.43 (foil $1.73), TCGplayer market prices via Scryfall.
This creature gets +1/+0 for each artifact you control. Whenever this creature deals combat damage to a creature, destroy that creature. The creature can't be regenerated.