I'm sure this has been talked about before, but I want to add such an option to the randomizer I am building, so I am interested in everyone's opinions.
We all know full random is great, but as more and more Dominion cards are released, we get less and less games with Colony/Platinum and Shelters. There's no reason to think that the original odds were somehow perfectly tuned, but something higher than where we are now seems better to me. I am interested in any ideas people might have about ways to adjust the rates other than just rolling the same odds each game.
I currently don't have any great ideas for Shelters because they don't seem particularly tied to the Dark Ages cards in a strong way. I might be happy with just a flat percentage for them. Perhaps biasing based on trashers or alt-VP would make since for interaction with Overgrown Estate/Hovel.
For choosing Colony/Platinum, the most obvious thing to do is to bias around powerful cards since this is basically what the default rules did when Prosperity was released. My current plan is to pick out cards that are strong, or might be made more interesting by the presence of Colony from other sets (e.g. Prince, Chapel, Wharf, Masquerade, Tournament) to add into the list of cards that are counted when determining the odds to include Colony/Platinum. The goal would be to push the overall odds back up to around 20%. (Odds were 22% when Prosperity released.) I also thought removing some weak cards from Prosperity might make sense too (Loan?, Talisman?)
I'm interested in any ideas about how to do this, or arguments against a particular method.