Wedding Ring is a mythic Artifact card from Secret Lair Drop (SLD), collector number 2802. Current market price: $2.75 (foil $3.44), TCGplayer market prices via Scryfall.
When this artifact enters, if it was cast, target opponent creates a token that's a copy of it. Whenever an opponent who controls an artifact named Wedding Ring draws a card during their turn, you draw a card. Whenever an opponent who controls an artifact named Wedding Ring gains life during their turn, you gain that much life.