My current deck (which I am thinking of taking to a local tournament coming up soon).

4-Sarcomancy
4-Vampire Lacerator
4-Carnophage
3-Skittering Skirge
4-Priest of Gix
4-Phyrexian Negator

4-Duress
2-Unmask

3-Diabolic Intent

4-Hatred

4-Dark Ritual

4-City of Traitors
2-Lake of the Dead
14-Swamp


A few notes and findings:

-I tested Culling of the Weak quite a bit, but ended up opting not to run it (and instead running the land based mana accelerants) in order to keep down on the number of creature sacrifice effects required. This allows a somewhat less creature heavy design to be used than otherwise would be necessary, which in turn allows the use of Duress and Unmask in the maindeck. I have found this to be just enough disruption to give you the edge you need in many matchups.

-Priest of Gix. In my testing so far, this guy is surprisingly powerful. With him plus the full suite of 1cc 2/2 zombies and lacerators, an opening hand with dark ritual in it can be pretty broken. Following up a turn 1 swamp with a turn 2 City of Traitors+Priest of Gix+whatever else you have in hand is not bad either.
I will be testing him more, but so far he seems to be adding a lot to the deck. In many cases it now seems as fast as (or even faster than) many Zoo decks I have seen lately.
Another benefit of using Priest of Gix is that it seems to help a bit with the “double black mana/City of Traitors” problem that I mentioned a couple posts back. For this reason Skittering Skirge is tentatively back again in the main deck.

-Diabolic Intent used almost exclusively to fetch Hatred (and thus win the game in short order). In this role it functions similar to Demonic Consultation in the days of yore (albeit not quite as powerfully). Three seems to be the correct number for this build so far.