Hearthpwn

While I do enjoy this deck, I can't help but feel like it could use a bit more improvement to it. I'm not sure what, though. Maybe I'm just too used to playing Plot Twist Warlock in Wild, with all the Voidcallers cheating in huge demons.

Perhaps a Dollmaster Dorian could be added in, though I worry there may not be a huge benefit doing so and would just be too slow. 1/1 Reborn minions are nice, but even they aren't guaranteed and may just instead be ordinary 1/1's, maybe even with Taunt occasionally. Not to mention it might give the game away a little too soon with revealing Mecha'thun in our deck.

All in all, though, I do enjoy this deck. Perhaps as the meta stabilizes we can see what needs to be changed and how this deck could be improved.

I might be speaking too soon but this deck is an absolute blast! I'm currently 5-0 with it at rank 10 (beat hunter, zoo warlock, quest druid, murloc pally and quest shaman - which was the hardest match-up)

This deck seems to be very well balanced with clears and healing and definitely enough minions to keep a decent board presence.
I got the quest done between turns 7-9 on all the match-ups with Plot Twist. The second plot twist was almost always used with Fel Lord Betrug for additional clears.

Thanks to the OP for the deck! 

Played 2 games with this deck so far and it's incredibly enjoyable. I did swap out Siamat for a Wrapped Golem because I don't own Siamat. I will most likely change the Wrapped Golem to something else, as I just needed a quick replacement.

I like the idea for sure...Mecha'thun win condition will be very nice vs other control decks if you can make it that far. Will def have to try it.

Thanks debating on cutting doomsayers and adding Dollmaster like in Kiblers list. Gains more tempo but could be punished against aggro.

So far I found that both Doomsayer were definitely valuable in the deck... could be wrong though. I didn't make any changes to your original list.