Hearthpwn

So I have always liked playing different types of OTK decks and I have been experimenting a bit with priest, after a couple of different versions of different combos i landed in to this deck which took me from rank 10-5 quickly and I am yet to climb further (edit: just reached rank 4). 

Though the concept of the deck diden't come out of the blue but rather evolved while experimentering. I started off playing an OTK deck with Stormwind Knight faceless. But while playing the deck i realized in one of the matchups that i could faceles a stolen card with potion of madnes and the faceles then got charge. I tweked and added cards that synergyzed around the combo as well as bringing a lot of card draw to the deck and this deck surged.

So in case you haven't figured the combo its based on buffing enemy minions with high base health with more health then potion of madnes or pint and then madnes and then inner fire you can also faceles afterward for dubbel the damage. Not all combo pieces are needed and emperor is not really needed either and the combo is mostly only used against control decks. The deck fairs well against agro decks also though you dont try to ensamble the OTK.

Matchups

Against control: The OTK is usually a must. Your main objective is to cycle your cards until you have ensambled enough pieces, be mindful of using pint size to remov with horror or cabal since you might have to draw the second one or try to find a 2 or less atack target. Doomsayer make usually an excellent target since your opponent will play them on a clear board.

Renolock: Mulligan for greedy card draw. loot hoarder, acolyte of pain, nortshire clearic. Your oponent wont interact much with the board until turn 4-5. Hopefully you have a shadow word death in case of giant. Otherwise the matchup revolves around keeping his board under control while cycling. Keep in mind that the combos strenght depends on oposing minions health and renolock doesen't exactly stay at 30 health. You might have lethal before you think you do. Twilight drake and doomsayer are excellent targets.

Vod: 

Renopriest: Relatively easy matchup, the presure is lower then dragonpriest and you can allow yourself to play greedy (waiting one turn extra before board clear). 

Dragonpriest: Though they usually have a strong early game their minions dont really deal much damage which allows you to pass heal a couple of turns if needed. Be careful with acolyte of pain you do want to draw and not get it shadow word pain or bookwyrmed. You may play this matchup without the OTK though its slightly risky. Dragonpriest have no removal for 4 atack minion hence you can create a high haalth minion and leave the inner fire for the moment you have lethal. Drakonid operativ is your liability as it might reveal your combo or give them inner fire or pintsize to kill your high health minion but also grant them unexpected burst since they otherwise dont posses it. Your removal shadow word horror + pintsize removes anything they can play so let them overcommit to the board believing they are safe with high health minions and dragons. 

Against midrange: This match up depends on your opponents ability to remove. You will usually be dead by the point you have a 28 or more damage combo hence its preferable to buff up one of your own minions. Though never if your oponent might have hard removal such as sap or hex. If im uncertain against removal i tend to buff a priest of the feast together with a faceless. Though if I have almost OTK i will wait and stale the game.

Against agro: Forget about the OTK and value (play northsire into a 3/2 for exapmple). Turn 1-3 are about surviving if you can survive withough having taken to much damage and without a disatrous board you can usually seal the game simply by playing a priest of the feast or brute + power word shield or divine spirit. Agro decks have no hard and this is the main advantage you have.

Have a look at the clip bellow includes some wins and loses at rank 5 (god dammit the last match up, watch it... it's so frustrating!). I will be upploading another video with climb to rank 4 after christmas. 

I will edit this post and might include a guide and more if it gets upvoted. 

Deck edit 1.1:

- 2 second rate bruiser

- 2 wild pyromancer

- 1 potion of madness

+ 1 shadow madnes

+ 1confuse

+ 2 cabal talon pritest

+ 1 doom sayer

Deck edit 1.0:

- 1 shadow word pain

- 1 holy fire

+ 2 second-rate bruiser

https://www.youtube.com/watch?v=686kMhF7cQw