Specter's Shroud is a uncommon Artifact — Equipment card from Darksteel (DST), collector number 142. Current market price: $0.33 (foil $2.12), TCGplayer market prices via Scryfall.
Equipped creature gets +1/+0. Whenever equipped creature deals combat damage to a player, that player discards a card. Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)