Uncommon printing of shock causes pauper decks to be marked invalid
A deck with the Historic Pauper format is marked as invalid if you have a preferred style for any card which is an uncommon printing.
For instance, shock from STA is uncommon, but otherwise legal in pauper.
The triangle error indicates "Non-format cards: 1".
It's not like we ever have pauper events, but I still have my pauper deck built and showing as invalid.
Replacing shock with any other printing is a workaround.
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Clawhammer#11595
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