I'm feeling like I post too much and too long, so I'll try to keep this short.
In terms of wins, I think just power cards like Library and Ancestral and then whoever gets off the turn 2-3 Dig, Cruise, Jace, Mentor.
Secondarily, I find that the decks that use Dack or Sylvan Library or Baby Jace to better effect, can win the less broken games more often and I actually think that's where one build or another is proven to be superior, since almost everyone runs 1 or the restricted cards. I also think the Joe Brennan style Mystical Tutor into Balance can be a very strong play situationally.
I don't think this is what you mean for the thread, but I've been reexploring Mana Drain since the restrictions, and rediscovering that it's still bad. I suspect that actually the main reason that it's still bad is the restriction of Brainstorm, and the lack of quality blue instants to play on the end of the opponent's turn. I'd say that, more than any other factor, including the taxing effects, makes tempo-blue still better than Wiessman-blue. But I don't really think that comparison was what you were angling for here.