Hearthpwn

Great deck. I made a few adjustments to focus on Jade buildup and it worked well for me. Check it out: 

https://www.hearthpwn.com/decks/1308597-karazahn-heroic-free-medivh-prince-malchezaar

btw this took me DAYS to defeat so thank you for the inspiration!!

Great deck! I have struggled with this boss for a while and I'm glad  I found this deck. Big thanks go to you. Keep it up!

Glad that helped you buddy :D

Just won with this deck after 3-4 tries. It works! But I used hadronox instead of Nzoth, and it worked wonders. There is a "non-hadronox, non-nzoth" version around that I tried before, but it simply was not working. 

IMPORTANT: I couldn't figure out if there is a difference in defeating Nazra via fatigue or via dmg when it comes to the "auto twisting nether" played by Malchezar right after. What I can confirm is that, both times I have defeated Nazra via fatigue, Malchezar didn't play the twisting nether card right after - but it played it on the following turn, since I didn't had enough ark on the board to defeat him. The few times I have tried defeating Nazra with dmg, the twisting nether was played right away, but I can't confirm if this is a pattern or just a coincidence.

In any cass, I had the opportunity to go to Malchezar's face for 1 turn. However, I didn't had enough atk to defeat him, so he played the "twisting nether card" the turn right after. Fortunately I had a lot of jades in hand and enough health to withstand his atk for 1 turn, so it was easy for me to recover and defeat him the next turn.

As I said in the description, only if you kill Nazra with fatigue he doesn't play nether istantly, it's a pattern as you thought :P 

About Hadronox, as I said to one guy few comments below it's also good, I just put N'Zoth due to his istant value.

Anyway I try to keep my PvE lists as cheap as possible, so everyone can play them, ofc if you have a lot of cards you can personalize my deck ;) Glad my deck helped you. 

Still can't fucking win lol, I always get to Prince Malc but no matter what he always uses board clear. Even waits until I drop auctioneer and clears it so I can't cycle idols. lmao fucking impossible.... 

You need to kill Nazra with fatigue, in this way he doesnt use board clear and you can oneshot him the next turn, just follow my instructions: "Note that you need her to die with fatigue, in this way Prince Malchezaar won't use Twisting Nether after you defeat the orc. " :P

omg finally i did i cant believe myself

after i try many different decks on this site this one is work for me

thx a lot :)

Glad that helped :D 

I found the instructions confusing (not having played the boss first), so added these.

Essentially, stay alive via the taunts. Use the Auctioneer towards the end to ramp up the size of your Jades using Idol. Throw some into your deck rather than make one first as it's your only way to make them (for the novices).

Do NOT create Jade Idols early as this will reduce your chance of getting the much needed taunts early on.

I killed the Orc via fatigue, but nonetheless faced a Twisting Nether. It took more than one turn to kill Malchezaar but at that stage I wasn't under threat of dying.

One more tip I think would be to hold off using N'Zoth, the Corruptor as long as you can.

It works well though and got it first go. Thanks for the deck!

Glad that helped you buddy, I think after few turns in game you understood my instructions, pretty easy to follow :)

best deck by far

did it first try 30hp and 20 ar left

Thank you for the feedback dude. Glad that helped you! :D

This is the first list that worked for me and I have tried a ton of them. Thank you so much. I did switch out N'Zoth for Hadronix since I don't have N'zoth. But honestly I think Hadronix might be better, It has the perfect attack to clear minions and gets you all the taunt minions back you've played even the ones without a deathrattles. 

When someone tries my decks, and I see that worked it's always an honor for me. :) 
About Hadronox: when i built the deck i was thinking to put him or N'Zoth, but then i decided to put N'Zoth due to his instant value, but yes, Hadronox is a great replacement for the ppl that doesn't have N'Zoth, you just need to replace another card and put an activator for him. 
Thank you for the feedback. :D

took me 4 tries. Thanks Great deck.

Glad that helped you buddy :D