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Mad Scientist
1783 • FP1_004
FP1 004.png
Dimensions: Full330 x 410px
FP1 004 Premium1.png
Dimensions: Full330 x 410px
Cost:2 Mana icon.png
Attack:2 Attack icon.png
Health:2 Health
Artist:James Ryman
Deathrattle: Put a Secret from your deck into the battlefield.
Flavor text

His mother wanted him to be a mage or a warlock, but noooooooo, he had to go and be a scientist like his father.

Referenced tags
Full tags
Wiki tags
Deathrattle, Put into battlefield
Wiki referenced tags
Random, Secret-related
External links


Mad Scientist is a common neutral minion card, from the Curse of Naxxramas set.

How to get[]

Auto-detected sources
AdventureDefeat NaxxramasGrobbulus in Curse of Naxxramas 4th wing - The Construct QuarterRegular2
Crafting40 dustdustRegular1
Crafting400 dustdustGolden1


Mad Scientist's Deathrattle will place a random Secret from your unused deck into play, removing the card from your deck.[1] However, it will not choose a Secret that you currently already have active, as it is not possible to have multiples of the same Secret activate at any time.[2]

  • If there are no Secrets remaining in your deck, or all remaining Secrets are copies of those already active, the Mad Scientist will not place any new Secret into play.[3]
  • The drawn Secret is not directly revealed to the controlling player, but can be checked by mousing over the Secret icon on the hero's portrait. The Secret is not revealed to the opponent.
  • A secret like LegacyMirror Entity put into play by Mad Scientist's Deathrattle after it has been killed by a minion's Battlecry (or Combo / Choose One effect) WILL trigger in the subsequent After Play Phase and affect the played minion. For example, if a rogue uses an LegacySI:7 Agent to kill a Mad Scientist, whose Deathrattle puts LegacyMirror Entity into play, then the Mirror Entity will copy the SI:7 Agent. This is due to the specific order that Battlecries, deaths/on-death triggers and After Play Phase triggers resolve. for more information see the Advanced rulebook. It seems that for now (as of Patch (WotOG patch)), the behaviour is intended.[4]
  • If a Mad Scientist's Deathrattle puts into play a secret which triggers from death (e.g., NaxxramasDuplicate, LegacyRedemption or NaxxramasAvenge), the secret will not trigger on the Scientist's Death Event.[5][6] This is because when we start resolving a Death Event (like the Mad Scientist's Death Event), we queue all related on-death triggers then resolve them. An on-death trigger that becomes eligible after this queue is populated is too late to join it.
  • If a Mad Scientist dies at the same moment as another minion, which entered play after the Scientist, and the Scientist puts into play a secret which triggers from minion death (e.g., NaxxramasDuplicate or LegacyRedemption) the secret will not trigger from the Scientist's death, but will trigger from the next minion's death.[7] This is because Death Events are resolved in play order, and each one queues all on-death triggers that are eligible when it begins to resolve. (This means that Mad Scientist pulling an on-death Secret can't have it trigger on a minion played before the Scientist or on itself.)
  • When a Secret triggers, it immediately leaves play, meaning that a Mad Scientist Deathrattle can immediately put another copy of that Secret into play. This can allow you to resolve two Avenges in the same Death Phase, for example.

Known bugs[]

As of January 2015, a known bug[8] allows Mad Scientist's Deathrattle to cause the player to exceed the 5 secret limit.[9][10] Mad Scientist still will not act upon duplicates of currently active secrets, but will put additional different secrets into play if available in the player's deck, essentially ignoring the 5 secret limit. This has been shown to allow at least 11 different secrets to be active on a hero at the same time. Secrets beyond the 5 limit will activate and take effect normally, and in the correct order.[11]


Mad Scientist is a very strong choice for any secret- or Deathrattle-oriented deck. 2 copies are commonly used even with as few as 3 secrets in the deck, especially for decks focusing upon the early to mid game.

Should the player remove all secrets from their deck before the Mad Scientist's Deathrattle can trigger, the Mad Scientist's value can quickly evaporate. This is particularly important for decks with low numbers of secrets. Despite this, as long as there are sufficient secrets in the deck to provide a good statistical chance of the Mad Scientist putting on into play, the minion can be considered a solid choice.

The threat of the secret put into play by the Mad Scientist can also be effective in affecting the opponent's plays, even if the player lacks the secret. However, be aware that a Mad Scientist that does not put a secret into play may provide the opponent with information regarding your remaining deck (see below).

No draw[]

The behaviour of this minion's Deathrattle means that should it fail to put a Secret into play, the controlling player therefore has either already drawn all of their remaining Secrets, or has only copies of existing Secrets left in their deck:

  • If the controlling player has no active Secrets, this means they have no Secrets remaining in their deck.
  • In Play mode, if the controlling player has Secrets active, this means they have up to 1 copy of each active Secret remaining in their deck. However, in Arena the number of remaining Secrets could of course be higher, due to decks potentially including more than 2 copies of a given card.
    • For example, if a player in Play mode with 2 active Secrets fails to draw a Secret from the Mad Scientist's Deathrattle, they have between 0 and 2 Secrets remaining in their deck.
  • Any Secrets left in the deck must also be copies of existing Secrets, allowing the player to discount other possibilities. Once any active Secrets have been revealed, the player can be certain of the identity of any Secrets remaining in the deck.
  • Note that this only indicates the contents of the player's deck - they may have Secrets left in their hand. Once the contents of the deck have been surmised, the maximum number of additional Secrets remaining can be learned from the size of the player's hand.
    • Careful counting of the cards in the player's hand can reveal whether any of those cards were Secrets, further consolidating the knowledge gained.

For example, if a player in Ranked play with 0 active secrets fails to gain a Secret from the Mad Scientist's Deathrattle, they have no Secrets left in their deck. If they have cards currently in their hand, the opponent can watch the position of those cards, and once they have all been played, can be sure the player has no other Secrets remaining this match.




Mad Scientists are mad scientists found in Naxxramas.

Wowpedia icon.pngThis section uses content from Wowpedia.
While "mad scientists", often referred as doctors, can come in any race and certainly are not exclusive to the Forsaken and Scourge, the undead do have their own specific kind of mad scientist, typically male Forsaken alchemists who utilizes their on own strain of chemicals from tanks strapped to their backs. While some work with Sylvanas to create an even deadlier plague, several are in the employ of the Lich King or the Shadow Council.



Mad Scientist, full art

Patch changes[]


  1. Ben Brode on Twitter. (2014-07-21). 
  2. Ben Brode on Twitter. (2014-07-21). 
  3. Ben Brode on Twitter. (2014-07-21). 
  4. http://us.battle.net/hearthstone/en/forum/topic/13840764128?page=1#15
  5. Tested by User:Taohinton, 2015-02-16. Mad Scientist's Deathrattle put NaxxramasDuplicate into play; did not activate from his death. Exactly the same with LegacyRedemption and NaxxramasAvenge.
  6. Ben Brode on Twitter. (2014-07-21). 
  7. Tested by User:Taohinton 2015-02-07. Tried both NaxxramasDuplicate and LegacyRedemption; in both cases Mad Scientist will cause the next simultaneous death to trigger the secret, but will not trigger it himself. Simultaneous deaths of earlier minions were found not to activate the secret, presumably because they are resolved before the Scientist's death.
  8. Ben Brode on Twitter. (2015-02-01). 
  9. https://www.youtube.com/watch?v=YRIw0nT0vtM
  10. [1] Tested by User:Taohinton and User:Xinhuan 2015-02-01
  11. [2] Tested by User:Taohinton and User:Xinhuan 2015-02-01