Cheapest priced copy (Shadows over Innistrad): $0.35 at Card Kingdom, near mint, their price list as of .
Ghostly Wings 
Enchantment — Aura · Common · Shadows over Innistrad · #66
Enchant creature
Enchanted creature gets +1/+1 and has flying.
Discard a card: Return enchanted creature to its owner's hand.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $1.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Shadows over Innistrad | 66 | Common | $0.35 | $0.49 |
| Torment | 38 | Common | $0.35 | $1.49 |
4 rulings from Wizards of the Coast
- 8 April 2016If Ghostly Wings leaves the battlefield before its activated ability resolves, the creature that was enchanted immediately before Ghostly Wings left is the one that will be returned to its owner’s hand, if it’s still on the battlefield.
- 8 April 2016You control Ghostly Wings even while it enchants an opponent’s creature. Only you can activate the last ability of Ghostly Wings.
- 8 April 2016After the last ability of Ghostly Wings resolves, it will be an Aura on the battlefield that isn’t attached to a creature and will immediately be put into its owner’s graveyard.
- 8 April 2016You can activate the last ability multiple times to discard multiple cards. Only the first ability to resolve will have any effect.