Altergeist too big brained for A.I. that’s why. Especially to lose to Dark Magician
I used Geists for an event on Master Duel that only allowed anime archetypes earlier this month.
Took Altergeist there that was severely nerfed: Multifaker, Meluseek, Hexstia, Protocol, tons of staple traps all Limited per the rules of the event to keep things balanced
Dark Magician got a lot of representation in that event so I played against a lot of people using it. Dark Magician was allowed to play pretty much everything minus Dragoons and all at 3, had access to all their waves of support, and my nerfed Geists still wrecked them as the superior Spellcaster theme