Quilled Greatwurm is a mythic Creature — Wurm card from Foundations (FDN), collector number 111. Current market price: $2.85 (foil $3.66), TCGplayer market prices via Scryfall.
Trample Whenever a creature you control deals combat damage during your turn, put that many +1/+1 counters on it. (It must survive to get the counters.) You may cast this card from your graveyard by removing six counters from among creatures you control in addition to paying its other costs.