The last time we had a ban in Commander was the relatively large banning in September 2024 when Dockside Extortionist, Jeweled Lotus, Mana Crypt, and Nadu, Winged Wisdom were all banned, and which ultimately lead to the dissolution of the Commander Rules Committee and Commander Advisory Group, and control of the format moving entirely over to Wizards
That means you are doing more of the work: getting the images, formatting fronts and backs, and pushing everything through a card designer tool that is not MTG-aware
They evaluate cards in a three-step process that consists of authentication, grading, and encapsulation, and their site lists the exact parameters for each number on the grading scale
With PSA 10 population still under 500 for this recent set, scarcity supports the premium
For example, you can put a Charmeleon card on Charmander, then later Charizard on Charmeleon