One day, I was distraught when I knew a card I loved and used for my Mecha'Thun Warlock deck was nerfed to oblivion and people started to say the deck archetype was not dead yet because Dollmaster Dorian can still help us to pull off the deck. But, I was too poor to craft Dollmaster Dorian and decided to craft a 400 dust epic card named Drakkari Enchanter that when dropped to gether with Emperor Thaurissan could Mecha'Thun to 8 mana and Cataclysm to 2 mana (as per picture above).
Card Selection Explaination:
I prefer to have the demon packages in the deck because Sense Demons can thin the deck by 2 cards at the same time providing you with some high roll probability with Voidcaller-Voidlord or Voidcaller-Mal'Ganis to give a hard time to aggro deck to hit face.
The deck has the ability to cycle the deck fast enough for you to drop Drakkari Enchanter and Emperor in one turn (Make sure Mecha'Thun and Cataclysm is in your hand to have their costs reduced twice) and survive the game long enough before you drop Mecha'Thun and Cataclysm to finish the game when your deck has no more cards.
In my opinion, the Dollmaster Dorian route combo requires you to keep 5-6 cards in hand towards the end of the game before the winning turn making your hand a bit clunky. With the Drakkari-Emperor route, you just need to have 4 cards midgame and drop the other 2 cards in one turn while keeping the other 2 cards till the end game. Keeping just 2 cards can avoid klunky situation where you play cards ineffectively.
Keeping 5-6 cards and keeping 2 cards to create a winning combo till the end game is a big difference. Believe me.. I've played the old 30 damage Freeze mage (many many many times than I should have) that requires you to keep 5-6 cards in hand before the OTK.. it sucks..
This card can pop your Voidlord before the Mecha'Thun-Cataclysm turn to avoid having any minion on your board via its deathrattle and lose the game.. lol..
It's also good for survival and using it on your Voidcaller to bring down a world of pain on turn 4.
I hope Mecha'Thun Warlock enthusiasts would comment and improve this list of mine to give Wild Hearthstone ladder players a little zing to rage quit when losing unfairly.
My Reddit name is /u/PorkyPain and I've been playing Hearthstone since 2015 just before the expansion "The League of Explorers" and have been playing wild since it's inception. If you guys like to add me and watch me pilot this deck please find me through GorBox#1712 [European Server].
Thank you. Happy gaming.