I like your deck! I'm working on a similar deck that also uses proliferate to speed up, or otherwise make the leveling up process more efficient. Playtests so far have demonstrated that my deck is weak against very aggressive decks and decks using horde or weenie strategies. I've decided to take a page from your book and add
path to exile for cheap removal and
norn's annex for extra control. I'll update my deck list soon, I hope you check it out.