Twilight Revelation

Exile the top X cards of your library, where X is the number of creature cards in your graveyard. Put all nonland cards exiled this way into your hand. You lose 6 life.
"Under the moonlight I was stricken with a horrible truth: that I was hollow. It chilled me with the reality that only my beating heart distinguished me from my army of undead. I frantically clung to my sanity, grasping for any remaining trace of my soul."
-Deletar, Arch-Necromancer