Beseech the Queen looks awful, I won't play it.

As for the SB, why is everyone cutting the Infernal Contract? It's one of my most wished for cards. I currently have six sideboard slots, I may cut the Thoughtseize or Tranquility for the 3rd blast. More than likely the Tranquility, I haven't wished for it in ages. Honestly, I'm starting to wonder why it's in the board. We do win before enchantress after all.

Also, Cabal Therapy? C'mon people, that's an awful idea. It's not better than 'Seize here. Even with Shusher. We don't play even close to the amount of creatures you need for Therapy. Why hardcast SSG, investing 4 mana into a discard spell.