O-Naginata is a uncommon Artifact — Equipment card from Saviors of Kamigawa (SOK), collector number 157. Current market price: $0.64 (foil $5.54), 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.)