For one thing, having to check both a banlist and a Game Changers list when building a deck, knowing both could potentially change in the future, makes Commander feel like less of a casual format
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And, believe it or not, it already exists in Magic: The Gathering in the form of Tifa, Martial Artist
But keep in mind, it's only current characters that lose their strength.
This bundle includes all four Magic: The GatheringFINAL FANTASY decks, each featuring cards themed around a different FINAL FANTASY gameRevival Trance (FINAL FANTASY VI), Limit Break (FINAL FANTASY VII), Counter Blitz (FINAL FANTASY X), and Scions & Spellcraft (FINAL FANTASY XIV)
It also sees competitive play in Modern, and sometimes shows up in Legacy