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F2P Heroic Thaddius Warlock by MrPLJ

  • Last updated Jul 2, 2015 (Blackrock Launch)
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  • 25 Minions
  • 5 Spells
  • Deck Type: PvE Adventure
  • Deck Archetype: Unknown
  • Boss: Thaddius
  • Crafting Cost: 520
  • Dust Needed: Loading Collection
  • Created: 8/13/2014 (Naxx Launch)
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Heroic Thaddius' Warlock

Hi everyone, and welcome to the final boss of the Heroic Construct Quarter: Thaddius! It is in my opinion one of the most fun battles in the add-on. With his Polarity Shift, it makes this game a little bit of a chess game.



Thaddius has his Polarity Shift Hero Power which switches the attack and health of all the minions on the field. He also starts his first turn by summoning for free Feugen and Stalagg on the field, however they will not have their deathrattle, but two minions at 4/7 and 7/4 that keep switching their attack and health means that you'll get 11 damage to the face until you can deal with them. So unless you want him to "Kill!" us, here is a Warlock strategy to beat him.


  1. To start off, I would like to say that this is based on a Zoo build, which means in mid-game you will usually want to Life Tap for extra draw and gain a hand advantage over Thaddius.
  2. To kick start the match-up you want to mulligan for a Soulfire and a Corruption as these two cards will eliminate the both Feugen and Stalagg swiftly. You will also want a 1 drop minion that you can play on your first turn.
  3. Edit: You can also switch Corruption for an Unstable Ghoul in the mulligan, as he takes care of Stalagg after the Polarity Shift whilst as usual, Soulfire will take care of Feugen. Thanks to Goge for bringing this up and giving us more options to deal with early game.
  4. Just to be clear, getting clear of both Feugen and Stalagg is the toughest part of the match-up but once done, things should go smoothly.
  5. After that, you want to control the board whilst buffing your Undertaker in the early and mid-game.
  6. You can use the Dire Wolf Alpha to take advantage of Polarity Shift and therefore continuously buff your other minions.
  7. Around turn 5 you will want to play either Feugen and Stalagg, especially if you have either a Shadowflame in hand or a Baron Rivendare on the field. Either minion will summon a (or two) Thadius when dead, which is an 11/11. Just try and play around polarity shift when you do so.
  8. Once the board is settled, you will be free to go for the face. You shouldn't have too much problems from then on.

The early game is the most difficult part of the game, but once you get rid of both Feugen and Stalagg, you should be fine. RNG doesn't play that big of a party in this match-up as you are playing a Zoo build and will be drawing a lot in mid game, making sure you can be mana efficient. Good luck guys and see you next week!

If you are having troubles with the rest of the Construct Quarter check my other F2P decks out for PatchwerkGrobbulus or Gluth.


Here is a great game from Kizaru1 using this deck to beat Heroic Thaddius, check it out!

Edit: After considering everyone's opinion in the comment section, I decided to switch -2 Voidcallers for +2 Unstable Ghouls for couple of reasons: it helps avoid face damage in the early game, reduces the attack of the minions on board for the next turn and Voidcaller is actually pretty useless apart from buffing the Undertaker. After testing, the deck seems more reliable in the early game.

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