O-Naginata is a uncommon Artifact — Equipment card from Double Masters (2XM), collector number 278. Current market price: $0.47 (foil $0.60), TCGplayer market prices via Scryfall.
This Equipment can be attached only to a creature with power 3 or greater. Equipped creature gets +3/+0 and has trample. Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)