Ylda, Twilight Avenger

Flying, Exalted, Twilight 1 (Ylda, Twilight
Avenger gains +1/+1 for each creature you
control with Twilight.)
{t}{w}{b} Search your library for an Angel or
Demon card with a converted mana cost lower
than Ylda, Twilight Avenger's own. You may cast
it for half it's mana cost or place it on the top of
your deck.
Untrusted by either side, they claim the world their
own to burn...