Crystal Slipper is a common Artifact — Equipment card from Throne of Eldraine (ELD), collector number 119. Current market price: $0.15 (foil $0.29), TCGplayer market prices via Scryfall.
Equipped creature gets +1/+0 and has haste. Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)