Contract Hero is a common Creature — Human Mercenary Hero card from Marvel Super Heroes Commander (MSC), collector number 683. Current market price: $0.24 (foil $0.31), TCGplayer market prices via Scryfall.
When this creature enters, create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.") Whenever this creature attacks, you may sacrifice an artifact or discard a card. If you do, this creature gets +2/+0 until end of turn.