Hearthpwn

This is a take on the Unlicensed Apothecary + Treachery + Mad Summoner combo which uses the cards Free Admission and The Dark Portal to heavily discount the combo pieces meaning you can get the OTK as early as turn 5 if you are extremely lucky!

We have the usual early game defensive tools such as Defile, School Spirits and Dark Skies to help survive the early game.  Hysteria is a nice new addition that can help deal with a big threat.  In order for our combo to work the opponent needs to leave us with an empty board for the combo turn so use your removal tools wisely.

We run only (4) demons in the deck so Free Admission will always discount by 2, making Apothecary cost 1 and Summoner cost 4.  If this happens Demonic Studies can be played to reduce the cost of Apothecary to 0.   A much better way to make the combo cheaper is if we hit one of our Summoners with The Dark Portal reducing its cost to 1.  We run 2 copies of Summoner and 1 of the other two demons in order to increase the chance of this scenario.  Enhanced Dreadlord is there to help us survive and it's deathrattle can provide some health regain to help against aggro.  Both Free Admission and The Dark Portal still have some use late game.  Portal in particular can be used to tutor C'thun and play it on the same turn.

Note: If you use Free Admission and there is only one demon left in your deck it will NOT get the discount.

Treachery is the hardest combo piece to find but you can still occasionally generate it off Twisting Knowledge.  If you draw your combo pieces too early you can put them back into your deck with Plot Twist and tutor them with a discount.  Sphere of Sapience can prevent you from drawing the combo demons in the first place.

Felosophy is an interesting addition but it has allowed me to place an extra copy of Apothecary on the board, making the combo a lot easier if they don't remove it.  It can also generate an extra dreadlord which can be a very valuable resource.

 Jepetto Joybuzz would be an alternative way to play this deck but it would make Free Admission whiff occasionally. 

I don't think the quest would be completed early enough to make it worth taking up a slot in your opening hand so I've not included it.

Here is a replay of a fun game where I managed to pull off a win despite the opponent managing to get 20 armor with 2x Kargath Primes!

https://hsreplay.net/replay/LU9qb7ejtdfRYFVnLCxMvU

Straight after, I had a game against Reno Mage who tried to use Dirty Rat to disrupt my combo.   Luckily, it hit my extra Summoner!

 https://hsreplay.net/replay/EsQh873BAvgiTsPnq2iwcY

Turn 8 kill vs Bomb Warrior, showing good use of Twisted Knowledge.  (Sphere of Sapience can deny bomb draws!)

https://hsreplay.net/replay/UCKP7HpFqp9o2SHoaoE7VX

 So far I've gone 11-4 with this deck at Diamond rank 10-5.