Cheapest priced copy (Duskmourn: House of Horror): $0.49 at Card Kingdom, near mint, their price list as of .
Ghostly Dancers 
Creature — Spirit · 2/5 · Rare · Duskmourn: House of Horror · #302
Flying
When this creature enters, return an enchantment card from your graveyard to your hand or unlock a locked door of a Room you control.
Eerie — Whenever an enchantment you control enters and whenever you fully unlock a Room, create a 3/1 white Spirit creature token with flying.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
4 printings · $0.49 to $2.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duskmourn: House of Horror | 13 | Rare | $0.49 | $0.79 |
| Duskmourn: House of Horror | 302 | Rare | $0.79 | $2.49 |
| Duskmourn: House of Horror Promos | 13p | Rare | $1.49 | $0.79 |
| Duskmourn: House of Horror Promos | 13s | Rare | — | $1.49 |
2 rulings from Wizards of the Coast
- 20 September 2024An ability that triggers "whenever you fully unlock a Room" triggers when a door becomes unlocked and the other door of that Room is already unlocked, or when both doors of that Room become unlocked simultaneously.
- 20 September 2024If a permanent with an eerie ability enters at the same time as one or more enchantments, its ability will trigger for each of those enchantments.