Bilbo's Gambit is a rare Instant card from The Hobbit (HOB), collector number 285. Current market price: $2.02 (foil $4.20), TCGplayer market prices via Scryfall.
Gift a Treasure (You may promise an opponent a gift as you cast this spell. If you do, they create a Treasure token before its other effects. It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.") Return target spell to its owner's hand. If the gift was promised, players can't cast spells this turn.