Marrow-Gnawer is a rare Legendary Creature — Rat Rogue card from The List (PLST), collector number CHK-124. Current market price: — (foil $29.61), TCGplayer market prices via Scryfall.
All Rats have fear. {T}, Sacrifice a Rat: Create X 1/1 black Rat creature tokens, where X is the number of Rats you control.