I would be very surprised if this deck was successful solely based on that fact that purple is the only offense. I have never seen purple work by itself...it seems to only work when teamed with another color. You should keep this thread going and update on how the deck is doing! Maybe you know something about purple that I don't but congrats to you if it works and good luck! 
Purple's lack of battle winners is a fairly big blow, but cards like ET, King David, Widow, and TToD (along of course, with AoCp and some of the new cards from TexP) make it a solid choice, up there with any of 'em. I recently started combining it with white to decent success, but stand-alone, it's still very good.
