Bilbo's Gambit is a rare Instant card from The Hobbit (HOB), collector number 5. Current market price: $1.23 (foil $1.50), 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.