Nim Devourer is a rare Creature — Zombie card from Mirrodin (MRD), collector number 70. Current market price: $0.30 (foil $0.65), TCGplayer market prices via Scryfall.
This creature gets +1/+0 for each artifact you control. {B}{B}: Return this card from your graveyard to the battlefield, then sacrifice a creature. Activate only during your upkeep.