However, there's a problem: One of the cards has been banned since the deck was created
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The problem affects the Mono White Aggro deck
It contains 3 copies of the Faceless Haven card
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Faceless Haven was banned from Standard in January 25, 2022
The company said that the card was too strong on its own, and to weaken Mono-White and Mono-Green, which were dominating the format, they had decided to ban it
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The solution found by Wizards is as follows:
"For tabletop formats: This deck will still be legal for tournament play in tabletop Magic: The Gathering formats, but only as is. Specifically, the 60-card deck and 15-card sideboard will be legal as long as no changes are made to it."
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That means the deck can only be played right out of the box, without any modifications
If the player decides to modify the deck, he/she must remove Faceless Haven from it entirely
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As Challenger Decks are a tabletop-only product, the deck will still be illegal in Standard on Magic Arena and Magic Online
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The other Challenger decks haven't been affected by this problem