Hearthpwn

Note: This is a challenge deck built for someone who's already beat heroic bosses, knows the strategy pretty well or wants some extra fun. It works very inconsistently and one successful attempt will be well enough after a lot of failures. If you have limited card collection, hope this can help you with your deck-building to defeat him!

Thank you all for the support, we finally conclude the whole 0-dust heroic LoE challenge with the most frustrating fight ever. It took me dozens of trials, but a win is a win!

There are 2 approaches in this fight:

the 1st one, as usual, is the Kel'Thuzad + Taunt bug, I include Mirror Image and Taunts summoned from Summoning Stone for this purpose. However, Rex's heropower can summon it removal spells. As a matter of fact, I've got rekt countless times to spells like Siphon Soul, Lightbomb, and Dark Bargain. Therefore this approach could be not as effective as in other fights.

Then it comes to the 2nd, which I used to defeat Rex, is to use a new bug featuring Animated Armor. It seems like Rex will hit face no matter if Animated Armor is on board. Therefore you need to play in a very smart way, solving the puzzle of its hunter secrets (for example, when to use hero power to triggerDart Trap, trigger Bear Trap before Frost Nova or Flamestrike, use Arcane Explosion after triggering Snake Trap or freeze them making Rex unable to play more minions.) Use Flamewaker for tempo board control or calculating minions' health for Frost Nova + Flamestrike to clear board. You need to play until Rex has no choice but to use Tail Swipe on that Animated Armor, and triggering your Duplicate for more protection.

If you can remove his big minions like Gahz'rilla, King Krush or summoned minions without using Polymorphs, save them for Savannah Highmane or sticky minions buffed with Ancestral Spirit.

The best way to open the game is to play the sole Mad Scientist on turn 2, trade in for or play the secret on turn 3, then Animated Armor turn 4. Be careful using other cards especially Mirror Image not screwing your plan over. You definitely need luck for this. I failed so many times that I've made an outtake video. Hope you defeat it without struggle. Good luck! Please refer to the decklist for the latest updates.