Hearthpwn

Just used this exact deck today (07/25/20) with no substitutions and it still works great. Thank you!

 I cant beat him, i dont know, who wants to help me, add me... Kouken#11334

I have two decks that beat this boss, if you need help.

worked after 4-5 trys , the demon clears the bord tho

doesn't work, melchazzar clears board entirely when he comes in

Great deck, this deck still work in Rise of Shadows expansion easy win ;)

Brilliant, thanks, first try with your version + all the helpful comments! 03/05/2019

Thank you! This is the deck that did it for me!

Still working. Had no Malfurion the Pestilent or Psych-o-Tron and only one Grizzled Guardian so threw in Rotten Applebaum Bewitched Guardian and Sludge Belcher to substitute. Took about 6 tries but it worked!

First try. Still works thanks.

Yep, works great. I think it took me 4 tries. Thanks for the deck! I replaced the Healing Touches with Rotten Applebaums and Creepers (3/6) with Druid of the Claw (4/6). I believe Malfurian helps with the combo – 3 Attack/3 Armor option comes in very handy. I would suggest saving the Barkskins for the Auctioneer. Also, I used one of the Moonglade Portals on Nazra to extend fatigue.

works still as of aug 26 2018 boomsday project.

Thank you for this deck! I managed to finally beat him after about 3 hours, then the combo finally rolled and malchezar got penetrated with 7 30/30 jades. I can confirm that he doesn’t use twist 1st turn when Nazra dies of fatigue.

I did the same alternations to my deck as @ungrounded in his post below.

Thank you, This worked for me with some alterations. I left out the healing touches and Malfurion, used Bewitched Guardians and Rotten Applebaum instead. I also used a second Grizzled Guardian instead of second barkskin. Made it thru the first part of the fight with about 22 health and Jades at 9 by holding her to very low health to stop her from using the weapons. 

Well play ! ;)

ai not attacking deathrattle minion with taunt a bug. Will ai never attack if i play grizzled guardian?

Thank you so much, bro! I attempted this for a total time of about 15 hours in the past with C'Thun, then gave up for almost half a year! Tried this deck and it didn't work for 10-12 tries, then I crafted Malfurion the Pestilent, and won on my 3rd or 4th try. Totally worth it, you've saved me from this eternal prison. 

Great ! I'm glad to hear that. :)

Changed a few cards but this was great. Thanks!