I think classic is a slight for the alpha players, if there even are any alpha players around anymore. However, I think classic is just going to get overrun with the best new cards, so I would recommend having NEW/MOD/WILD/ALPHA with a split of 20/30/40/10. I think classic just moves the value to beta/untamed and devalues alpha, so I would keep the alpha designation with a much smaller prize allocation.
Within each category, RF/GF split should be AT LEAST EVEN, but I would prefer to see slightly more prize for GF since those are the more expensive cards, but that's just my two cents.
I think Classic with Alpha Beta and Untamed is fair, with no new sets ever added. Those sets were before the game really blew up. Certainly you'd at least include Beta surely. I don't see why the prize allocation should be smaller either. If you invested $5k in 2019 you should earn the same per victory as if you invested $5k in 2023. Allowing otherwise is just asking for card values being almost guaranteed to gradually depreciate over time.