Looks pretty good. I would add Wash Basin and try to work a Vain Philosophy in there. If you do add Wash Basin then I would add Escape to Egypt (combos well with High Places and Wash Basin). I would also switch The Thankful Leper in for Martha or just drop her. I think going to 56 cards wouldn't be too bad so you have a few less souls in your territory, but it's up to you if you're trying to play faster or slower.