Wedding Ring is a mythic Artifact card from The Lost Caverns of Ixalan Commander (LCC), collector number 102. Current market price: $31.59 (foil $99.05), 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.