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Set:The Boomsday ProjectThe Boomsday Project
Minion type:Mech
Cost:10 Mana icon.png
Attack:10 Attack icon.png
Health:10 Health
Abilities:Deathrattle, Destroy
Wiki tags:Battlefield-related, Deck-related, Hand-related
Artist:James Ryman
Deathrattle: If you have no cards in your deck, hand, and battlefield, destroy the enemy hero.
Flavor text

"Your software will fail. Your users will abandon you. You are already obsolete."

External links

Data pageHearthpwn

Mecha'thun is a legendary neutral minion card, from The Boomsday Project set.

How to get[]

Mecha'thun can be obtained through The Boomsday Project card packs, or through crafting.

Card Crafting cost Disenchanting
Mecha'thun 1600 400
Golden Mecha'thun 3200 1600


  • Mecha'thun will destroy the enemy hero even if the controlling player has Secrets or Weapons equipped.[1]
  • Destroying Mecha'thun with a Reincarnate will successfully activate the Deathrattle effect if its condition is satisfied.[2]
  • Mecha'thun will destroy the enemy hero even if the controlling player controls a Permanent.[3] It is unknown whether this is a bug or intended.[4]
  • Mecha'thun's effect will destroy immune heroes.
  • Mecha'thun's effect still activates even if there is a friendly minion with Reborn destroyed, since Reborn effects always trigger after Deathrattles.
  • If Mecha'thun is killed at the same time as a minion whose deathrattle would place cards in the player's hand or deck, such as Shifting Shade or Bad Luck Albatross, Mecha'thun's deathrattle will not activate, despite the hand/deck being empty at the time of its death. It appears that the Mecha'thun deathrattle is calculated last regardless of where it is placed on the board, possibly due to mana cost priority.


Mecha'thun offers one of the few guaranteed win conditions in the game, but its requirements are very demanding. Not only is drawing out your entire deck a time-consuming process, emptying out your hand and clearing out all other friendly minions is just as tricky. Otherwise, as a vanilla 10/10 it's largely useless.

If you play Mecha'thun with no assistance, there is no guarantee it will survive to the next turn to combo it to meet the requirements. Even if you filled all the requirements, there's always a chance it could get silenced or transformed on the opponent's turn, negating all your hard work. One-turn combos are still possible however by summoning it through alternative means or using Galvanizers to reduce its cost to be more manageable.

Hemet, Jungle Hunter can delete your low-cost cards out of your deck to empty your deck as soon as possible. Keening Banshee also helps with deck thinning.

Potentials combos to instantly kill Mecha'thun include:

  • Druid:
  • Playing Mecha'thun followed by Innervate and Naturalize on Mecha'Thun will work if you have no other minions and cards in your hand. Alternatively, Dreampetal Florist can help reduce the cost of Mecha'Thun where you can play it + a Naturalize on the same turn.
  • Hunter:
  • Play Mecha'thun as well as two Ticking Abominations, using N'Zoth, the Corruptor and Feign Death (playing Emperor Thaurissan with these two cards in your hand will provide the discount you need) to resurrect them all and trigger all their deathrattles. This combo relies on only N'Zoth and Feign Death being in your hand, but ignores your board state as you will be dealing 20 damage to your own side of the board. Alternatively, using Galvanizer to reduce Mecha'thun's cost and having Goblin Prank as the only card left will ensure that Mecha'thun will die at the end of your turn.
  • Priest:
  • Rogue:
  • Warlock:
  • Play a Mecha'thun, followed by Bloodbloom and Cataclysm. This combo is the simplest to do, and can also be used with Genn Greymane strategies since all the cards in question (including the Galvanizers) are even-cost (the discounted hero power will allow you to draw through your deck more quickly as well). After the Bloodbloom nerf, it now requires extra mana discount effects. At minimum, it requires two Galvanizers and Emperor Thaurissan discounting both Bloodbloom and Mecha'thun. Alternatively, Drakkari Enchanter and Emperor Thaurissan can be used together to discount Mecha'thun and Cataclysm down to a 10 mana combo. Both Mecha'thun and Cataclysm have to be discounted all in the same turn. This requires an extra turn to set up in comparison to the Dollmaster Combo, but it requires less combo pieces and is less susceptible to counters like Dirty Rat.
  • Play Plot Twist while you have Dollmaster Dorian, Kael'thas Sunstrider, Mecha'thun, and any cheap spell (cost 3 or less) in hand. You can play the cheap spell before or after Plot Twist. Then, play Cataclysm. This version costs at least 8 mana to play and doesn't require mana discounts, and all three minions aren't destroyed by Hemet.
  • Warrior:
  • Play The Boomship with Mecha'thun and Malygos in your hand, then use Inner Rage on both minions and a Whirlwind to kill them both. This combo doesn't require Galvanizer, and you can have up to 5 minions on your side of the board provided none of them are above 6 health.
  • Play Mecha'thun at some point during the game (preferably after Dr. Boom, Mad Genius to use it as a 10/10 Rush). Finish with Da Undatakah, Inner Rage, and Devastate. This only requires four combo cards and three of the combo pieces have applicability in other matchups, although it limits you from using other Deathrattle minions.
  • A backup strategy with Mecha'thun Warrior is to use Galvanizer for a 9-mana Mecha'thun then kill it with Shield Slam. While there's no guarantee you will have 10 Armor, control Warrior decks often find themselves with very large amount of armor stockpiled up.




As the name suggests, Mecha'thun appears to be a mechanical version of the Old God C'Thun. This version of the Old God is unique to Hearthstone. It was created as part of Dr. Boom's Boomsday Project, "for some reason".[5]


  • A very early design for the card that became Mecha'thun was a doomsday scientist intent on destroying the world, with one version being a goblin called "Doctor Doomsday". Since its win condition was to destroy the whole world, it had to have a cost of 10 mana; specifically, a 10-mana 1/1 minion with the text: "Battlecry: If this is the only thing in your hand or deck or battlefield, you win". However, Blizzard then wanted to go one step further, requiring the player to have no minions in their battlefield in order to activate the card's effect, so it was changed to a Deathrattle. Having the minion be a 1/1 made it too easy to kill, and having a giant robotic Old God provided the cooler fantasy, so the minion was changed to the 10-mana 10/10 Mecha'thun.[6]
  • Mecha'thun's flavor text is a reference to various famous C'Thun quotes from World of Warcraft, many of which were repurposed for C'Thun's original Hearthstone debut in Whispers of the Old Gods.
  • Mecha'thun's summoning quote reminds vaguely a quote from the Animatrix [7] "Hand over your flesh, and a new world awaits you.", soon after that quote, there's a violent thermonuclear bombing explosion, resembling the dramatic deathrattle of this minion.


Mecha'thun, full art

Patch changes[]


  1. Peter Whalen on Twitter. (2018-07-29). 
  2. HysteriA (2018-08-10). Hearthstone Mythbusters 60 - BOOMSDAY SPECIAL. YouTube. Retrieved on 2018-08-11.
  3. HysteriA (2018-08-28). Hearthstone Mythbusters 62. YouTube. Retrieved on 2018-08-31.
  4. Mecha'thun + The Darkness. (2018-08-12). Retrieved on 2018-08-12.
  5. Unused Dr. Boom boss encounter dialogue
  6. Cam Shea (2018-09-27). Hearthstone: Team 5 on Designing The Boomsday Project's Legendaries. IGN. Retrieved on 2018-10-02.
  7. animatrix