Old Gnawbone is a mythic Legendary Creature — Dragon card from Adventures in the Forgotten Realms Promos (PAFR), collector number 197s. Current market price: — (foil $57.65), TCGplayer market prices via Scryfall.
Flying Whenever a creature you control deals combat damage to a player, create that many Treasure tokens.
All Adventures in the Forgotten Realms Promos cards and prices