Mono Black Vampires.
Confidant driven aggro with hand disruption, and a grinding machine consisting of Kalastria Highborn and Liliana the Last Hope.
Bloodghast and Gifted Aetherborn are core beaters.
Gatekeeper of Malakir and Fatal Push are our removal package, and Gatekeeper can help with beats.
Dark Confidant fuels us.
Inquisition of Kozilek, Thoughtseize, Collective Brutality and Liliana of the Veil disrupt our opponents strategy.
Kalastria Highborn provides a 4 point lifeswing when one of our 14 vampires die, and Liliana, the Last Hope lets us recur either the highborn, or her fuel.
Vampire Hexmage provides a spicy answer to planeswalkers, As Foretold, Aether Vial,Ratchet Bomb, Engineered Explosives, +1/+1 counter strategies etc. And is also a 2/2 First Strike beater, that feeds the highborn.
Phyrexian Obliterator is a curve-topper. I'm not sure if this quite fits, it lacks complete synergy, but is immensely powerful, and I absolutely love the card. One could hope that some opposing Path to Exile's have been drawn out early game by Bloodghast or Dark Confidant, making a clean answer mroe unlikely, and an unclean answer to an Obliterator often spells the end.
Input is much appreciated. A light splash can be considered, perhaps for post-board.