Aura Swap is a keyword ability.
702.64. Aura Swap
- 702.64a Aura swap is an activated ability of some Aura cards. “Aura swap [cost]” means “[Cost]: You may exchange this permanent with an Aura card in your hand.”
- 702.64b If either half of the exchange can’t be completed, the ability has no effect.
- Example: You activate the aura swap ability of an Aura. The only Aura card in your hand can’t enchant the permanent that’s enchanted by the Aura with aura swap. The ability has no effect.
- Example: You activate the aura swap ability of an Aura that you control but you don’t own. The ability has no effect.