Just like the color filter has a colorless option, I think it need a Phyrexian option, but not 5 more options. This way as I'm deck building I could filter on "One of : White, Blue, Phyrexian" and it would return all my white cards, blue cards, and any color phyrexian cards. Alternatevily I could search for "All of: Red, Phyrexian" and get just the Phyrexian Red cards.
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