Hearthpwn

Intro:
This is a new-ish Rouge archetype created by Reynad.
The basic concept of the deck is to make big combo's and finish off your opponent with a huge C'thun.
I feel in love with the idea back a few months ago when i saw Reynad play his version of the deck on stream, but forgot about it not too long after.
But then a few days ago i rediscovered the deck. I didn't totally agree with Reynad's list (for example he was using Youthfull Brewmasters), so i started changing the list up - removing some of the cards until I had a list that were more focused around C'thun than the previous one. 
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(yes, I'm low rank on the picture i haven't had time to play much this month)

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Card Choices & Playstyle:
This deck has 9 cards that draw in order to quickly cycle though the deck and reduce the chance of getting a clunky hand. (2x Loot Hoarder, 2x Novice Engineer, 2x Shiv, 2x Fan, 2x Azure Drake and 1x Thalnos)
We have Backstab, SI:7-Agent and Disciple of C'thun to be able to deal with early game treats, we also have two Earthen Ring Farseers in the deck that are good for healing up if we feel like our opponent is being too aggresive.
This deck runs no Sap, instead it has two Shadow Strikes - the reason behind this is quite simple: Thing from Below (also known as 0 mana 5/5-taunt)

Brann Bronzebeard:
Enables combo's that would otherwise be impossible to pull off.
The most important combo being to target Brann with Shadowcaster in order to get two one-mana 1/1 Branns in your hand, which is extremely good with Blade of C'thun.
He can also be used to heal for more with Earthen Ring Farseer in order to beat aggresive decks. You can deal 60+ damage in one turn if you manage to play C'thun and Brann in the same turn (after using shadowstep on C'thun)
Blade of C'thun:  
Your main tool to grow your C'thun, as mentioned above it combo's really well with Brann as the battlecry trigger twice meaning that if you devour a Ragnaros you'll be adding 16/+16 to your C'thun - which means game-over for your opponent if you ever get to play your C'thun.
Although it might look tempting you generally don't want to use Shadowstep on Blade of C'thun as it's much stronger when combined with C'thun. The only time i would recommend doing it is against decks that plays a lot of big minions, like Ramp Druid or Control Warrior.
Shadowcaster:
This card let's you generate an unlimited amount of cards with the propper setup, which can be a secondary win-condition in control matchups. It can also be used to copy Blade of C'thun.
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Mulligan Guide: 
Against Aggresive Decks: Backstab, SI:7 Agent, Loot Hoarder and Disciple of C'thun. (Thalnos if you already have Backstab)
Against Control Decks: Novice Engineer and Loot Hoarder (Azure Drake can also be fine if you know it's Control Warrior)
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Please Remember: This deck is quite hard to play, it has a lot of micro managing and you need to keep an eye on your hand-size at all times so don't be disappointed if you lose your first couple of games or if you end up making misplays.  :)

If you enjoyed this guide and/or like this deck please leave me a thumps-up as i put a lot of times into these. Feel free to ask me about anything in the comments.