I think there's some room to improve your mana base. You're so all-in on color fixing that I was expecting to see a number of double or triple W and B spells in the deck. Yet... all your B costs are a single black mana and generic, so you don't need cards like Fetid Heath at all. With four BW fastlands, 4 Godless Shrine, and 8 fetches you're more than covered for curving out with B, 1B, into WWW.

So consider cutting the Heath for another Vault, a basic (if you're nervous about Blood Moon), or to cut a land entirely if you find you tend to flood out.

Nice deck! +1

I would up the Disenchant or Chalice of the Void in the side and drop the x2 Leyline of Sanctity. 2 doesn't seem enough. If your devoting 4-6 sideboard cards to burn why not go x4 leyline? I get you're playing white and can cast it turn 4, but it sounds like a turn 2 chalice does the same thing, but stops 1 drop creatures/artifacts/enchants as well and you only have 1 card to deal with something like Ensnaring Bridge or Ghostly Prison.

If you're worried about storm and scapeshift, you have hand disruption galore. Just switch Relic of Progenitus for something like Surgical Extraction. You have Rest in Peace to deal with dredge.

My recommendation would be to either get some more answers to anti-aggro or add some reach like Leechridden Swamp or something similar in the side.

Then again, I don't know what you usually play against, so I may be way off.

Thanks for the upvote and suggestion! I probably will go down the Relic of Progenitus and put Anguished Unmaking to have more answer to cards like Bridge.

I think Omeros is right about the mana base with Fetid Heath. I don't think you should cut lands all together though. With Average CMC being over 2, I would tend to say you are right on track with 24 lands.

How are the Concealed Courtyard's treating you? I find in a lot of decks that if use 4-drops as an integral part of the deck that I seem to hit fast lands when I need something else to keep the game going smooth. Are you having that problem?

Great deck!!!

I don't really see that problem frequently. The fastlands are there to help conserve our life total in the early turns. While you have s point on 4 CMC threats sometimes being played off pace because of it, it hasn't happened to me often and isn't that backbreaking when it does.