Hearthpwn

update 1/7/2018: after some tuning, I removed one Doomsayer and The Darkness to make room for two Dirty Rat. These tech cards seem to be working better for disrupting the gameplay of many decks, however fighting against Razakus Priests is still pretty hard. Doing good against Aggro and Tempo decks.

update 1/9/2018: removed one Dirty Rat and the Tar Creeper for two Gnomeferatu. On top of being more versatile than the creeper and less punishing than the rat, they are a good choice for early trades and a nice primer for Defile. Touched rank 10 very early in the season (I play HS not so often).

 The deck shines against Aggro/Tempo, I think it entails the right amount of single target removals, taunts, and AoE cards. Against these kind of decks, you obviously want to hold on to your early game cards and board clears during the mulligan. Possessed Lackey is also a card to keep, especially when you get The Coin. Don't underestimate  Chittering Tunneler, you can get a lot of value from it (sometimes a nice Treachery can save you the day!), and it upgrades your spellstones.

Be "aggressive" in mirror matches and try to play Skulking Geist as soon as possible to destroy your adversary's plans (if you play against CubeLock, most of the time this will be your winning move if done by turn 5/6). 

Against Razakus Priests, I usually go for the Rin, the First Disciple plan. Unless you want to drop some cards for Mountain Giants and put pressure on them, there's really not much you can do to stop them and their plan. I tried The Darkness, it slows them but that's not the way to win.

Old deck that I renewed recently, it has become a sort of Cube-Control Warlok. I'm still messing with it so I think it should be considered still under construction.