Never mulligan, and always choose to draw. Then discard a dredger to hand size.
You can discard a Phantasmagorian instead of a dredger, and then use it to discard 3 to 6 cards (you discard 6 by responding to its activation with a second activation.) Don't discard baubles.
Dredge like your life depends on it. Cast and sac baubles to hurry things along. (Gitaxian Probe would be so much better but unfortunately it's banned.)
Using your creatures to convoke (particularly the zombies you get from the four Bridge from Belows in your graveyard), cast Hogaak, Arisen Necropolis from your graveyard as often as you can. There are two of them and they're legendary, so tap one to convoke the other and keep the untapped one. You'll still need to delve 2+ cards from your graveyard for this. Keep all the finishers but delve away the rest. You should amass a stupid amount of zombies this way.
Flashback the second Dread Return on a Chancellor of the Forge, saccing nontoken creatures when possible. You get more zombies and a stupid amount of goblins.
Repeat the Hogaak cycle, tapping goblins, the other Hogaak, and zombies until you run out.
Repeat the Dread Return a Chancellor cycle twice more.
idk, this is fun and all but just seems like a way to get blown out by Fog. I would rather run Griselbrand or Whirlpool Rider as my self-mill piece, drawing seven is usually enough to dredge the library to nearly empty. I typically leave 2-3 cards left so in case something goes wrong I don't die to my own millout. Flayer of the Hatebound + Prized Amalgams entering the battlefield plus Undying the Flayer by sacing it to something = 4+5+3+3+3+3 = 21 direct damage to the face, gg. If they have white Leyline then just tear their hand to ribbons with Therapies and overrun them a turn later with zombies, flying demons, trampling Hogaaks, flying Amoebas, etc. If their mana is tight you can finish your turn with a reanimated Chancellor of the Annex, she can mess up an opponent's plans with her tax effect.
4 Golgari Grave-Troll
4 Golgari Thug
4 Shambling Shell
4 Stinkweed Imp
Helpers
4 Balustrade Spy
4 Ichorid
4 Mishra's Bauble
4 Narcomoeba
2 Nether Shadow
4 Phantasmagorian
4 Street Wraith
4 Urza's Bauble
4 Bridge from Below
4 Chancellor of the Forge
4 Dread Return
2 Hogaak, Arisen Necropolis
--Kurt Vonnegut, Jr., who is up in Heaven now. EDH WUBRG Child of Alara WUBRG BGW Karador, Ghost Chieftain BGW RGW Mayael the Anima RGW WUB Sharuum the Hegemon WUB RWU Zedruu the Greathearted RWU
WB Ghost Council of Orzhova WB RG Ulasht, the Hate Seed RG B Korlash, Heir to Blackblade B G Molimo, Maro-Sorcerer G *click the general's name to see my list!*