Manriki-Gusari is a uncommon Artifact — Equipment card from Saviors of Kamigawa (SOK), collector number 156. Current market price: $0.33 (foil $7.99), TCGplayer market prices via Scryfall.
Equipped creature gets +1/+2 and has "{T}: Destroy target Equipment." Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)