You're gunna wanna make room for Mental Misstep , Mana Drain and Force of Will . Free counter magic and proactive counter magic go a long way at keeping you alive to be able to do your strategy.

Cool build. Got a +1 from me.

If you're wanting to go more competitive, eliminate all but one of your win cons and go all out on that one win condition. Maybe have a "1 card win con" as a back up like Torment of Hailfire or Expropriate .

If it were me, I'd stick with the Jace/Lab Man combos. Those are your 2 key pieces and everything will either go infinite with them or protect them.

If you eliminate the other cards from your deck, that'll give you more room for control, protection, and/or synergies with that one combo, and you'll be able to pull it off even more consistently than you already do.

My last recommendation would simply be more card draw. You seem like a good deck builder so I assume you already know all that's out there in Blue and Black regarding to draw. You definitely need more.