I love it. As far as affinities go, maybe a divine one that deals with banishments and stuff? Although I suppose that can be a part of white and conjouring. other than that I see a 'counter' for everything, for the lack of better word. 

One more question: Are we restricted to the affinity, or are the others possible to use, only much much harder?

Gonna start working on a char now, I am really starting to fall in love with the concept :D