The biggest downside to Erika is that, because it focuses entirely on Grass, it wont see much play in any other decks that dont specifically revolve around it
Necroface Necroface is a great beat-stick for banish orientated decks
(Ill leave discussion of what truly delineates CEDH from high power Commander to those more involved in that end of the format, however.) An Exhibition (1) deck is almost always built with some major quirk in mind
Artificer Class The only AFR class that didnt come from the main set, Artificer Class was printed in Battle for Baldurs Gate
The precon comes with some Impetus aura cards you should consider casting on Baeloth to potentially allow him to work more consistently
Beyond card images, there's a world of interesting AI/ML applications with Magic, like what others have worked on for drafting, deck optimization, and game play