Xalaxz, Guider of Doom

+2: Return up to one Dragon or Demon card from your graveyard to your hand.
-6: Destroy target creature. Create a 7/7 blue Wall creature token with "Whenever this creature attacks sacrefice it at end of combat".
-12: Search your library and/or graveyard for any number of Dragon and/or Demon cards and put them into the battlefeild. Then shufle your library.