Mantle of Tides is a common Artifact — Equipment card from Throne of Eldraine (ELD), collector number 52. Current market price: $0.11 (foil $0.35), TCGplayer market prices via Scryfall.
Equipped creature gets +1/+2. Whenever you draw your second card each turn, attach this Equipment to target creature you control. Equip {3} ({3}: Attach to target creature you control. Equip only as a sorcery.)