-1 mind rot
-1 consuming vapors
-1 wall of frost
-1 mana leak


It's a tough call, but that's what i would probably do.

I like the look of this. There are a couple of suggestions I can make to help you improve it, though.
   Firstly, I would replace horrifying revalation and Mire's toll with Inquisition of Kozilek & Duress. The problem with the ones you're using now, is that they allow the opponent to decide what card to show you/discard.
   I would also take out Traumatize. It doesn't really do much in a discard deck unless you have some way to interact with the graveyard. In essence, you are spending 5 mana to discard a card and have virtually no impact on your opponent.
   I would lose the diabolic tutor as well. You aren't trying to assemble any combo pieces here, so it's pretty much just a wasted card slot. Replace it with the card you would want to draw with it.
   Guul Draz Specter, Quest for the Nihil Stone and Liliana's Caress are your kill cards. I would play 4 of each of those.
   Jace is great, I would also play 3 Liliana Vess if I could.
   In addition to Mana Leak, you may want to take Deprive, and/or Spell Pierce. You will probably also need some Creature removal; Doom Blade, Disfigure & Go For the Throat are all good options.
   I always liked wall of Frost, but you may find that it's better to play a slightly more aggressive card. Liliana's Specter may be a good replacement.


Can't wait to see it in action.