Maledictor

Jesus this deck looks brutal to face, but I was wondering whether the Windborn Muse would stack with the Ghostly Prison etc.

While I really like the idea w/ the splinter twin/pestermite/venser it doesnt really feel like the prators other than the white one really add all that much to the deck. Personally I think you should drop some of your 7 mana+ creatures and add 2 more vensers as they're semi important to your main win con and add some counters and a little bit of burn in order to stall your opponent until you can get your combo going and in order to help make sure your pestermites can survive long enough w/ the splinter twin.

Then in order to help w/ avoiding mana problems you might wanna add in lands such as Arid Mesa to avoid getting stuck w/ out one type of mana.

Meh, doesn't seem like Pulse Trackers would last nearly as long as the blood seekers since in multiplayer ppl are quick to kill stuff like that.

You probably have a reason for not using it but it seems like Black Sun Zenith would be a nice addition. Seems like the deck's weakness would be swarm decks as sacing a few creatures for them isn't really all that bad while even just a couple -1/-1 counters out would kind of shaft them.

I can see the Garruk staying in there for his -4 ability but imo liliana and sorin dont fit in there. The hunters feast also seems a little bit expensive for a 6 life gain. Unlike rusted I'd say keep the putrefax as it can be a very major game changer. Also I'm not a bit fan of contagious nim I'd probably say drop it for plague stingers.

Why not replace the Megrims w/ Liliana's Caress?

So I might be missing something but is the bazaar trader just to give your abyssal persecutors away right before you win/lose?

IMO Hedron-Field Purists would go very nicely in the deck as would exsanguinate.