Sidisi self-mill/dredge deck with a touch of reanimate. Still kind of experimenting with it, but it seems really fun.

The overall objective of this deck is to assemble a swarm of zombies and beat face with them. Zombie lords and creature buffs like Filth are there to make them a little more threatening. Most non-zombie creatures are in the deck to facilitate the self-mill machine to keep the hoard growing or to generate card advantage in some way. The two Eldrazi titans are basically just insurance to keep me from decking myself.

Fun Combos:

Gravecrawler + Phyrexian Altar = Sac the crawler to the Altar to add one black mana to your pool and use that to recast the crawler.

Diregraf Captain + Gravecrawler + Phyrexian Altar = Infinite damage.

Embalmer's Tools + Gravecrawler + Phyrexian Altar = Infinite 2/2 Zombies with Sidisi in play. Tap the crawler to mill yourself 1, sacrifice it to the altar for a black mana, play it from the yard, then tap it again, rinse and repeat. This thing curves perfectly into Sidisi too, so you have a potential turn 4 must answer situation. Or you could just mill out your opponents on turn 4.

Cryptbreaker + Seedborn Muse = A ton of draw with virtually no disadvantage except for the life loss.

Path of Discovery + Sidisi, Brood Tyrant = means every time you generate a zombie token you get to explore, potentially dumping another creature into the bin, generating another zombie. Rinse and repeat. This combo is crazy good with Embalmer's Tools, Parallel Lives, and/or Altar of Dementia, nevermind the aforementioned Gravecrawler + Phyrexian Altar combo.

Mesmeric Orb + Sidisi, Brood Tyrant = 1 mill instance per untap means you grab a token for each creature you dump in the yard. Brutal. Embalmer's Tools on top of the Orb can just get absolutely silly, since untapping just once with the Orb can net you a couple zombies which you can keep up for blocking, then tap with the Tools at your last opponent's end step for essentially double self-mill. The fact that both the Orb and Tools are so low on the curve means its really easy to set up. The downside is that the Orb generates a ton of hate.

Mesmeric Orb + Seedborn Muse + Sidisi, Brood Tyrant = Lets you mill yourself during each opponents upkeep and likely amass a huge zombie horde by the time you get back to your turn.

Filth + Urborg, Tomb of Yawgmoth means your horde is unblockable. Straight up Cheese. I prefer Filth to Zombie Master since Filth allows Sidisi, Brood Tyrant to swing in unopposed if you need to give your army a jump start.

Exploration + Ramunap Excavator and any fetchland = gives you guaranteed 2 land drops per turn. Life from the Loam also goes pretty well with Exploration.

I'd like to find a slot for Glen Elendra Archmage, but I'm having a heck of a time deciding on what to cut for it. Any suggestions on that, or overall, are always welcome.