My approach to an AI for MTG would be to not even pretend to play by the same rules, just make a series of challenges the player can face with their deck, Slay

My approach to an AI for MTG would be to not even pretend to play by the same rules, just make a series of challenges the player can face with their deck, Slay the Spire style. Like, one challenge the Computer adds 2 "Zombies" each turn and attacks, next challenge the Computer plays a random arc-bound card and each card on the table has a 50% chance to attack, etc, etc. Players can build their decks and then see how far they can get through the challenges.