Vault of Ulthuran

{t}: Add either {w}, {b} or {2} to your mana pool

If Vault of Ulthuran is tapped, you may at any time look at the top card on your library. You may then choose to reveal it. If the revealed card is a Mortal Follower or Demonhost Creature, summon Two 1/1 White/Black Mortal Follower creature token.
If it is a Lesser Demon or Greater Demon, immediatley draw it

The vaults hold no value to mortals. To delve is to seek annhilation