BGs main problems seem to be that Foundations doesnt have the best expensive creatures in either color (barring bomb rares of course), and the ones that exist trade poorly with common interaction like Banishing Light and Bake into a Pie
6: You get an emblem with "Swamps you control have ': Add .'" 3: Target creature gets +X/+X or -X/-X until end of turn, where X is the number of Swamps you control
Discounting the legal aspects of the entire situation, this argument rings hollow, mostly because it's not just expensive cards that are being counterfeited

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These are labelled under MTG Spider-Man Eternal-legal, so can only be used in Commander, Legacy, and Vintage games