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Context because Apparently I formatted this wrong:
I am in a best of three game with my friend through Discord Challenge. We completed game 1 without issue while i am playing simic nexus, which includes 4x Nexus of Fate. During sideboarding, the game will not allow me to submit my deck even if all 4 copies of the card are taken out.
Oof, yeah it should definitely allow you to play with the card in Best of 3 Direct Challenges and Discord Challenges. We will take a look; thank you for the report!