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I not only spent time researching what cards needed to get swapped in and out during certain matchups, based on other people's experiences with the deck, but I also made myself a quick-reference sheet that I could use the whole weekend to guide me on my sideboard process during matches

The only difference is a Planeswalker symbol in the lower left corner, like what you find on cards from The List in Set Boosters

Borderless FINAL FANTASY artist cards are available in Magic: The Gathering FINAL FANTASY Play Boosters and Collector Boosters, appearing in both non-foil and traditional foil

That means you probably want cards like Pyretic Ritual or Manamorphose

This is incredibly useful if a card has errors that are not noticed upon first creating it and should definitely be available for free