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Keyword Action
Introduced Mystery Booster
Last Used Mystery Booster
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Challenge is a keyword action, introduced on a test card in the Mystery Booster set. A player may challenge another player to reveal certain cards in their hand to counter a certain effect. If the challenge is successfully met, the effect will be enlarged. If not, the effect is nullified.

If you're challenged, you may reveal any number of cards from your hand. The effect that allowed a player to challenge you will specify what you must reveal to win the challenge.[1]

The Challenge mechanic was originally designed by Richard Garfield for Dominaria.[2]



Xyru Specter {2}{B}{B}
Creature — Specter
Whenever Xyru Specter deals damage to an opponent, that player discards a card unless they challenge you. If challenged, and you show them two black cards in your hand, they must discard two cards.


  1. Eli Shiffrin (November 11, 2019). "Mystery Booster Release Notes". Wizards of the Coast.
  2. Gavin Verhey (November 14, 2019). "Unraveling the Mystery Booster". Wizards of the Coast.