Arcanum Wings

Oracle Text

Enchant creature

Enchanted creature has flying.

Aura swap 2U (2U: Exchange this Aura with an Aura card in your hand.)

Card Rulings

5/1/2007 The exchange is simultaneous, and happens on resolution.
5/1/2007 If 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.