To add a few more thoughts...
- Finding a way to let
High Priest of Penance survive a little damage could be really useful. That or having an ability to ping him yourself in response to things. I saw a build using
Staff of Nin for this exact purpose. Dude was able to block a creature with the priest, then ping it and take out the other attacker. But I'm thinking things like
Divine Favor or
Holy Mantle... hell... even
Mask of Avacyn. None are ideal, but if you can turn him into a mini
Phyrexian Obliterator you won't be complaining.
- Why not rock the other Exalted knights? I see some
Knight of Glory in the SB. But why not
Knight of Infamy? Why SB rather than MB? Who needs a chump blocker if your nighthawk is lifelinking for 5-6 a turn?
- I would say to run more concrete, hard removal than
Tragic Slip. OR at least add some variety to it.
Ultimate Price in the MB? Even
Murder could be really useful. Drop
Tragic Slip to maybe 2-3x and go from there.
- I might be wrong, but
Mutilate strikes me as a terrible option for you here. If you have even three swamps in play, the only one of your creatures that will survive is
Obzedat, Ghost Council. Funny if you have
Blood Artists - not so funny in your case. Odds are you would end up screwing yourself up more than them in most cases.
- I'd also suggest trying the deck with
Blind Obedience in the mainboard. It can stop blockers, slow down any aggro deck, and all with the added benefit of an extort trigger. Paired with some
Thrull Parasites, even a top-decked one drop can be a big deal.
-
Blood Crypts? You can cast Reckoner with just white mana. Unless you need the red for something else, you'd be better off drawing a plains than one of these.
- I don't know that I would run
Cavern of Souls in this build. Sure, it can be a mana fixer, but it can also get you stuck if you name the wrong creature type, as then it's just a colorless mana producer. If you had more synergy with more humans or thrulls or spirits, I could see it working, but I can see where it'll trip you up a fair number of times given your scattered creature types.