Hearthpwn

Just a cheeky bit of theorycrafting with Mecha'Thun, using Even Warlock as a base. I will be testing this deck day 1 of the expansion, and will also post a Mulligan guide if this can get +20 up-votes. Note that this deck list is likely to change before 'The Boomsday Project' is released.   

In case you missed it, combo is as follows:

1. Empty your deck (easy to do with 1 mana hero power)
2. Play 2x Galvanizer with Mecha'thun in hand (cost will be reduced to 8 mana)
3. Play Mecha'thun
4. Play Bloodbloom and Cataclysm.
5. Bam you win!

General Guide:

Gameplay: This deck is meant to be played in almost the same way as a standard even control Warlock, that means you want a big hand and board control. Where this deck differs from a normal list, is in the late game. The Mech’thun combo (shown above) enables a fairly consistent win rate against heavy control decks, provided you use you hard removal wisely.

The biggest problem with this deck is tapping too aggressively without healing. Against aggro decks in particular, you really don’t want to be falling below the 15 hp mark, and if you do, that’s where we use Hooked Reaver for a bit of defence. Against control however there is a much lower risk of burst damage, so provided you have board control and taunts you can draw your deck much faster.  And Remember when we hit the late game, Gul’dan is there to heal you back up.    

Mulligan Guide:

Against Aggro; we want to control the board early and clear our opponent’s small minions with AOE. This means we are looking for any of our 2 cost minions in our opener, excluding Galvaniser, and we are also after Hellfire and Defile.

Against Control; we are also looking for our precious 2 drops, however instead of trying to get AOE, we want our 4 cost minions especially Twilight Drake. I would also recommend keeping a Spellstone in hand if you are holding any Vulgar Homunculus’, as they are easy activators for more damage and healing.    

Changes:

Edit: I decided to replace 2x Loot Hoarder with 2xPlated Beetle for better early game.

Edit #2: After playing a few games I've realized a number of changes that could be made; I find Dread Infernal can be a bit clunky in some situations, as a result of this I beleive that its can either be replaced with Glinda Crowskin (for a cheaper combo or more low cost minions, or a Skulking Geist (for against aggro decks like odd rouge, and zoolock. 

Edit #3: After more revision it has come apparent that the meta is very aggro, to counter this I have replaced a Sunfury Protector and a Dread Infernal, with 2x Doomsayer.

If you like the deck please up-vote

Huge thanks to everyone who has given feedback and supported this deck, great to see a tonne of people having fun with this!