firebolt is actually for deathrite shaman, stoneforge, and delvers creating a source of card advantage.  Revokers are there for things like Lili who's edict effect is a bit rough when you're playing control with a painter out (or deed, etc).  and uses against sneak attack.  could easily be 1 revoker main, 1 canonist main, and 1 more revoker side, but I find that revoker has a lot of game in many matches whereas Canonist is a little more specialized. 


White also gives you much better access to Ensnaring Bridge G1, which Sneak and Show can't beat.  E-tutor and flip top in response to SnT (and you can easily have a red blast backup if they force) and the game is over.  I'm considering changing the Bridge in the sideboard to a singleton Peacekeeper, as that can be tutored with Recruiter, and provides a different type of permanent in post-board games for Sneak/Show to deal with.


I wish there were a better option than manic vandal though - Viashino Heretic has been suggested, but I don't like that it isn't hasty.