Just tweeted this but wanted to make sure it's here for y'all too:
There are three 2 cost followers that are in her origin but will not appear in her disguise pool: Blastcone Seedling, Harbinger of Thralls, and Frostcoat Cub
These followers have choice options, which does not work with Neeko's disguise choice tech. When these options were present during dev, choosing them would give you the base card form e.g. you'd get a Blastcone Seedling with no keywords. This not only gave you a worse unit, but also gave away that you just played Neeko, so we really didn't want to let that happen.
The engineering required to make these cards work with Neeko is effectively a non-option, so after a few weeks of discussing different solutions, we aligned on having a banlist for exactly these three. This solve also lets us handle any future problematic 2c origin-subtyped followers should they arise.
All of the other...
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