Ninja's Blades is a rare Artifact — Equipment card from Final Fantasy Promos (PFIN), collector number 108s. Current market price: — (foil $4.85), TCGplayer market prices via Scryfall.
Job select Equipped creature gets +1/+1, is a Ninja in addition to its other types, and has "Whenever this creature deals combat damage to a player, draw a card, then discard a card. That player loses life equal to the discarded card's mana value." Mutsunokami — Equip {2}