Ashiok, Nightmare Weaver, is not banned in the Commander format. The premise of the question is incorrect. Players are permitted to include this planeswalker in their Commander decks, provided it aligns with the deck’s color identity and complies with other format rules. It is possible that the inquiry stems from confusion with other cards or a misunderstanding of the current ban list.
Commander format rules are established and maintained by the Commander Rules Committee. Changes to the ban list are generally made to address cards that negatively impact the play experience by promoting repetitive, unfun, or overly oppressive gameplay. This process aims to foster a diverse and enjoyable environment for all participants.
