Dancing Sword is a rare Artifact — Equipment card from Adventures in the Forgotten Realms (AFR), collector number 8. Current market price: $0.29 (foil $0.44), TCGplayer market prices via Scryfall.
Equipped creature gets +2/+1. When equipped creature dies, you may have this Equipment become a 2/1 Construct artifact creature with flying and ward {1}. If you do, it isn't an Equipment. Equip {1}