It seems like cards that were printed as common in Antiquities are not considered Pauper legal despite not being banned in pauper https://www.wizards.com/magic/tcg/resources.aspx?x=magic/rules/pauper I'm not sure if I'm missing something or not but it seems like they should be legal for pauper, thanks!

Hey,

Yep, the check for Pauper format is actually very naive and just looks if everything is common. We've added to the todo list an entry to make it a bit smarter. (also EDH is naively checked for 100 cards, nothing else).