You'll have a strong incentive to keep servant on blue, even against blue decks, since a good deal of the spells you'll want to counter and almost all the permanents you'll want to destroy will be non-blue otherwise. 2 painters on the table at once is asking a bit much.
A deck based on painter/grindstone, reap and lifeforce (possibly vexing shusher) could be fun and possibly competitive? Has anyone tried? Black gives you duress, rituals, tutors, and confidant.
This deck already runs confidant, ritual, and duress, and replace bad cards like lifeforce and shusher with rebs and wheel of fortune.
If you feel like you want the game to play out more slowly and controllish, you can name blue and blow up there permanents and shit. but you also have the options of naming black and having a mini yawgmoth's will, which would certainly do a good deal towards winning the game. 2 rits, an ad nauseam and 1 black mana is only 3 permanents.
