First of all I want to say that I am actively open to discussion about changes improvements etc and openminded to new opinions. Indeed I'm putting it up to see what possible critiques could be made of it to make it more explosive, competitive etc. Thus follows roughly what my deck is trying to do.

Erebos control deck, with lots of early and midrange hate to keep you alive against early creatures and stop combo decks in their tracks early with hand disruption and mana rock shutdown. It also runs edicts to provide answers to well protect voltron commanders. It also includes some hate for graveyard based strategies. We are running a lone sinkhole against gaia's cradle and nykthos/other high priority lands.

The deck aims to stall out the game, and then set up one if its many card draw engines in order to take control of the game.

Once you start to gain card advantage, a big black mana sub theme quickly ramps you into the lategame where you can take control of the game.

Game are typically won with some of the strong synergistic combos and interactions, combined with lategame win con cards like yawg will or rise of the dark realms.

A powerful tutor package of demonic, vampiric, demonic consultation and vampiric tutor dig for the answers and wincons you need.

Some key combos and synergies are:

Basalt Monolith + Rings of Brighthearth + Exsanguinate/Drain Life/Profane Command

This simple 3 card combo can instakill the table, and also let you make huge draws off Erebos.

Exquisite Blood + Sanguine Bond - known instant win combo, cards such as sorin, temporal extortion are also insta wins.

S Sorin Markov/Temporal Extortion + Wound Reflection - Sorin kills at end of turn with wound reflection, and temporal extortion is a guaranteed extra turn with the reflection.

Venser's Journal/ALhmaret's Archive + Erebos/Necro/Phyrexian Arena/Graveborn Muse - generates and supports ludicrous draw.

Vampiric Tutor + Erebos/Sensei's Diving Top - insta draw what you need.

Sorin + Rings of Brighthearth + Wound Reflection - double to 10, or potential double kill.

Deserted Temple + Coffers + Rings of Brightearth - Another infinite mana combo!

Helm of Obedience + Leyline of the Void - known instakill combo.

Cabal Coffers + Vesuva + Thespian Stage + Urbog + Petrified Field - these cards all have a strong synergy with the coffers, and the field will bring back a strip mined coffers. Never underestimate tutoring for it.