his is an aggro/combo deck built to abuse Thrull Parasite and Gravecrawler. If you have a way to sacrifice Gravecrawler—and Thrull Parasite in play—you can continually recast it to trigger extort. If you don't have Thrull Parasite, Blood Artist can extort for free. (It can do this even if you do, actually, which is even better.) This deck can also use Thrull Parasite's second ability to remove a counter from Geralf's Messenger or Butcher Ghoul to allow it to undie again.
With so many cheap creatures and cheap removal spells, it's realistic to make a Demon with Skirsdag High Priest as early as turn three, and you can do it again every turn after that.
Bloodthrone Vampire and Blood Artist combine to kill someone from a surprisingly high life total.
You'll notice that white is splashed exclusively for Cartel Aristocrat. This allows for extremely consistent mana to cast Geralf's Messenger (Cavern of Souls will usually name Zombie), while still allowing you to have plenty of sources for your white card, and if you can't cast it right away, you should still be fine. Obviously, this splash comes at some cost, so the question is whether it's worth it just for Cartel Aristocrat.
Honestly, I've been blown away by the card. I was happy when I saw it previewed because it's just my kind of card (really, there's nothing I like more than sacrificing my own creatures), but it has greatly exceeded my expectations. It's awesome that the opponent can't kill your sacrifice outlet, since that's the card that lets all your other cards work, and it's an excellent blocker that can also get in through blockers in a pinch.
Demonic Zombie Cult