King Macar, the Gold-Cursed is a rare Legendary Creature — Human Noble card from Journey into Nyx (JOU), collector number 74. Current market price: $0.36 (foil $7.71), TCGplayer market prices via Scryfall.
Inspired — Whenever King Macar becomes untapped, you may exile target creature. If you do, create a Gold token. (It's an artifact with "Sacrifice this token: Add one mana of any color.")