Chalice of the Void @ 1 is a concern for the deck, but mainly because it stops Brainstorm, Chain of Vapor and Cabal Therapy. Against the common Ancient Tomb Aggro-Control decks packing Chalice of the Void, if you manage to drop Aluren out, you will usually go Necropotence with Wall of Blossoms and Raven Familiar in order to drop a few Tarmogoyfs out, return their fat guys home with Man-o'-War recursion and use Force of Will to stop these if needed. Then you win through standard beatdown. You would need a bit of life to do so efficiently, but this is still a very solid B-plan when facing Chalice of the Void. Tarmogoyf really opened a lot of options for Aluren, and Chalice of the Void @ 2 is much more problematic (fortunately, Chain of Vapor works fine there). Pernicious Deeds come in pretty much all the time.
Mesmeric Fiend is just here for situations where you do not feel safe passing the turn after going off (very unlikely), as it allows you to Mind Twist the opponent. Its advantage over other cards is that it is not dead before going off, it will act as another Cabal Therapy if you want to clear Force of Will, and will then make your real Therapies better.
SB is still pretty random. I'm not sold on Leyline of the Void either, which is why I mentionned Heap Doll or Offalsnout. Extirpate works fine too.
I do not like Lim Dul's Vault. UB is indeed a serious concern, as well is the card loss off it. I'd run the 4th Intuition over Lim Dul's Vault if I had room for that, or even an Impulse or the old Chord of Calling tech we had at GP Lille.