You should really add an Urborg. It seems trival but really does a nice job with Coffers. Love the go big theme!

Dude this deck looks great! Strong focus on acceleration and generating big mana (I have an extra Urborg, Tomb of Yawgmoth), plus all the good fatties. You sir are a chubby chaser! Ideas I had: Compared to Jet Medallion, theres no card type your casting repetitively to 2:1 yourself for Semblance. Walking Atlas-Nightmare- Void Winnower- Suffer the Past- Titan's Presence- Innocent Blood- Essence Harvest- Ancient Craving- Underworld Connections; seem too random/ weak. Black is the best at finding what it wants and theres lots of tutors to be had! Dark Petition can be your 2nd Demonic Tutor, and Buried Alive/ Victimize is just insane. Being able to play into your Grave Pact effects with Mikaeus, the Unhallowed/ Abhordent Overlord and sac outlets can control the board and generate alot of manas. Overall I think this deck is going to function fine and throw out some pretty sweet stuff, although 36 lands might have you stuck annoyingly often. NIce!

Antwon* bc you know..

I think I will give ole Antwan a shot and slowly phase out the eldrazi to use elsewhere.

I used to run Erebos as my general, but apparently the interview went well and my father got-a-job!! Hahahahha

Pretty solid from the looks.  I'd cut visara, avatar, and hand of emrakul.  Put sheoldred in and some instant spot removal.  Bond of Agony can go, it is purely a 'winmore' card (you need more land and more life to cast it).  I don't like sign in blood and nights whisper, skeltal scrying, ancient craving, bloodgift demon, greed, necroepoetoe, phyrexian arena all serve better menthinks.  Replaceing a card for two is meh.  What about darksteel pendant?  Deathrender can go, you don't have many sac outlets or creatures to burn for it.  I don't know what infernal darkness does.  I'd fill back in with better deck manipulation (scrizzle) or graveyard shenanagans (animate dead).