Hearthpwn

This is a midrange Demon Warlock that has early game removal to survive the early game and mid-late game threats and combos to help outvalue or smorck down the opponent. 

It has potential infinite value with Soulwarden if you happen to discard one and two other cards to guarantee that you get back one Soulwarden every time.

Rin, the First Disciple, Skull of the Man'ari with Doomguards, Bloodreaver Gul'dan and Mountain Giants are good against control or slower decks. 

Against fast decks, hard mulligan for any early game, such as Defile, Hellfire, Plated Beetle, Shadow Bolt(very good against Hench-Clan Thug), Tar Creeper, etc. as those decks are a weakness to this deck if they have a good start and you don't have ways to defend. 

I have no statistics or records with this deck but it has been performing very well against most types of decks, from aggro to midrange to combo/control. Its very versatile as you can have a different play style according to your opponents deck. It also adds an element of surprise as this is not a very known or expected deck which can cause opponents to mulligan incorrectly.

As of January 14, I have climbed from rank 10 to rank 3 in two days after not playing much. I definitely think, if played correctly, this deck can take you to Legend.