Cheapest priced copy (Future Sight): $0.79 at Card Kingdom, near mint, their price list as of .
Arcanum Wings 
Enchantment — Aura · Uncommon · Future Sight · #48
Enchant creature
Enchanted creature has flying.
Aura swap {2}{U} ({2}{U}: Exchange this Aura with an Aura card in your hand.)
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.79 to $11.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Future Sight | 48 | Uncommon | $0.79 | $11.99 |
2 rulings from Wizards of the Coast
- 1 May 2007If on resolution, half the exchange can’t be completed (such as if the only Aura in your hand can’t enchant the permanent), nothing happens.
- 1 May 2007The exchange is simultaneous, and happens on resolution.