Avik, Captured Thief

Defender (This creature can't attack)
{t}{u/b} Exile the top card of an opponent's library.
If it is a noncreature spell you may cast it this turn
using any color of mana. If a card has been cast
this way this turn you may exile Avik, Captured
Thief, then return her to the battlefield
transformed under her owner's control.

"Let me out!"