Asori, Artful Exemplar

Auras enchanting Asori have Aura swap.
The Aura swap cost is {w}{w}{w}.
Whenever an Aura enchanting Asori is exchanged, if the Aura returned to your
hand has a higher converted mana cost than
the Aura leaving your hand, reveal the top
card of your library. If it's an Aura, put it
into your hand.