Goldspan Dragon is a mythic Creature — Dragon card from Kaldheim Promos (PKHM), collector number 139p. Current market price: $11.86 (foil $16.80), TCGplayer market prices via Scryfall.
Flying, haste Whenever this creature attacks or becomes the target of a spell, create a Treasure token. Treasures you control have "{T}, Sacrifice this artifact: Add two mana of any one color."