Also, do you tend to
a) mix up the "blue cards" from all expansions together ...
There's been some threads on that. ...
Hmm. Might try out the following steps:
1. Choose X sets (based on player familiriaty with more complicated game mechanics and play group boredom with set Y)
2. Pick 10 full random or semi-random (e.g. to exclude "too complicated and of marginal utility to really bother explaining" cards when new players are present) amongst them
3. Veto vote: 50+% players disagree (I usually play only 4 player games) -> a card is out.
At the end of a round - 4. Let the last place finisher choose 0-2 kingdom cards to stay on the board for the next game (slightly less reading through new cards compared to full random for new players, also twists some game mechanics present in the previous game)
... Prosperity is one of my least favorite. I guess I just don't enjoy the super power cards. To me, any game with King's Court is worse/more boring IRL than any alchemy heavy game I've ever played.
...which is exactly why I would like to know my playgroup member responses to "big plays" prior to making a blind purchase (as mentioned earlier in the thread). I do know that they hated Scrying Pool, but that was more likely because multiples take ages resolving.