Headmaster Kel'Thuzad

Headmaster Kel'Thuzad is a legendary neutral minion card, from the Scholomance Academy set.

Secret effect
Summoning 6 cat minions while Headmaster Kel'Thuzad is in play will add a copy of Mr. Bigglesworth to your hand.

Click 'Expand' to view all minions considered "cats" This is a list of minions that count as cats for Headmaster Kel'Thuzad to summon Mr. Bigglesworth. This also counts uncollectible minions and even some adventure-exclusive minions.
 * Collectible


 * Uncollectible


 * Adventures

Fixed bugs

 * Internally, Headmaster Kel'Thuzad uses the same counter for both his Spellburst having been triggered and the amount of cats summoned to get Mr. Bigglesworth, which causes buggy interactions when both of Headmaster Kel'Thuzad's triggers are used simultaneously. If his Spellburst triggered first, you will only need to play four cats to get Mr. Bigglesworth. If you played a cat minion first, then playing even a non-spell card will trigger his Spellburst. This bug with cats acting as Spellburst triggers was fixed with Patch 18.2.0.58213.

Strategy
Headmaster Kel'Thuzad has good stats for the cost, but his true potential lies in his Spellburst, when combined with cards like Lightning Storm or Flamestrike, given that the opposing Hero has a decent board of low-health minions. If you wish to either activate his ability later or simply cannot use it, playing it may not be such a bad idea, as your opponent will be hesitant to play any minions if they do not have an answer to Kel'Thuzad. This could backfire if your opponent has a spell like Fireball, wasting his ability.

Headmaster Kel'Thuzad is also good for stealing a single minion. Using Headmaster Kel'Thuzad followed by a Coerce or Shadow Word: Death on the 8/8 from Libram of Hope or something like Kalecgos can be devastating, sometimes more so than a board of small minions.

The easiest way to get Mr. Bigglesworth is using Halazzi, the Lynx followed by Emperor Thaurissan. This will give you a large number of 0-mana cats, letting you easily fill the board. Keep in mind that this has no practical purpose - Mr. Bigglesworth is functionally identical to a Snowflipper Penguin - and is merely a just for fun combo.
 * Mr. Bigglesworth

Lore
This card depicts Kel'Thuzad while he was still a human necromancer, before his battle with Prince Arthas.

In this earlier period of Azeroth's history, he is the Headmaster of the Scholomance Academy, a renowned magical institution of higher learning he founded with Lord Barov and Mindrender Illucia which really serves as a cover for the activities of the Cult of the Damned taking place under the school - the slaying of students and locals from the region to provide corpses for The Scourge, and the hideous necromantic torture experiments of Doctor Krastinov, Ras Frostwhisper, and Disciplinarian Gandling.

Trivia

 * In the public Hearthstone Team AMA on April 14, 2020, the developers were hinting at cats as being a special thing in the upcoming year. This might have been a reference to Mr. Bigglesworth, or potentially more things still yet to come in the expansion after Scholomance Academy. As of May 2021, it seems to be about Bigglesworth.

Patch changes

 * Headmaster Kel'Thuzad's Spellburst will now resurrect minions that are destroyed by spells that swap Attack and Health, and spells that have been granted Poisonous by Professor Slate.
 * Summoning a cat will no longer allow Headmaster Kel'Thuzad's Spellburst to trigger on the opponent's turn. The Headmaster just gets really excited about cats...
 * Server-side patch (2020-08-13): Fixed a bug where Headmaster Kel'Thuzad would not resurrect minions that were destroyed from being returned to a full hand.
 * Added.
 * Added.