Cheapest priced copy (Adventures in the Forgotten Realms): $0.49 at Card Kingdom, near mint, their price list as of .
Dancing Sword 
Artifact — Equipment · Rare · Adventures in the Forgotten Realms Promos · #8p
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}
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $0.49 to $5.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Adventures in the Forgotten Realms | 8 | Rare | $0.49 | $0.49 |
| Adventures in the Forgotten Realms | 360 | Rare | $0.49 | $0.49 |
| Adventures in the Forgotten Realms Promos | 8a | Rare | — | $5.49 |
| Adventures in the Forgotten Realms Promos | 8p | Rare | $0.49 | $0.79 |
| Adventures in the Forgotten Realms Promos | 8s | Rare | — | $0.69 |
2 rulings from Wizards of the Coast
- 23 July 2021If you choose not to have Dancing Sword become a creature as its triggered ability resolves, it will remain an Equipment and can be equipped to another creature as normal.
- 23 July 2021If a player casts a spell that targets multiple permanents their opponent controls with ward, each of those ward abilities will trigger. If that player doesn't pay for all of them, the spell will be countered.