This priest deck got me to 15. I bet with a couple more epics, it could be something:
http://i.imgur.com/oSFRUJ4.png
There's a Mind Control at the bottom.
My favorite move in the entire game is using Shadow Madness to steal an opponent's minion for a turn, using that minion to my advantage, and then straight up stealing it for myself with one of the Brewmasters.
Second favorite move is making a copy of Velen and getting insane Holy Novas or Holy Fires off of it.
This deck used to have every silence in the game that priests can use, which was hilarious when it really paid off, but it was too inconsistent. I bet it'll be amazing when Naxx arrives. Silence + Brewmaster to get the silencer back is real fun.