Tzeentch, Changer of Ways

Eminence — Whenever a creature attacks, that player exiles the top card of their library.
Indestructible
When you cast Tzeentch, or Tzeentch attacks, you may cast up to three spells exiled with him without paying their mana costs.
{u}{b}: Each player exiles the top card of their library.
As long as there are less than 9 cards exiled with Tzeentch, he isn't a creature.