Jeweled Torque is a uncommon Artifact card from Mercadian Masques (MMQ), collector number 301. Current market price: $0.24 (foil $2.92), TCGplayer market prices via Scryfall.
As this artifact enters, choose a color. Whenever a player casts a spell of the chosen color, you may pay {2}. If you do, you gain 2 life.