Goldspan Dragon is a mythic Creature — Dragon card from Modern Horizons 3 Commander (M3C), collector number 212. Current market price: $11.52, 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."