Hi all,
Just wanted to share a method for picking kingdom cards that somewhat changes the rules of the game, but not too much. Here goes:
1. Before the game starts, assemble a deck of randomizer cards from whichever games/expansions you wish. It is sufficient to have one playable game to pick from, but you will need at least 21 randomizers (more than 50 is perhaps overkill and pointless, but doesn't harm anything). Also decide in advance whether you are playing platinum/colony or not.
2. There are only basic money and basic victory cards available for purchase at the start of the game (including platinum/colony, if you chose to use them.)
3. Players start with 3 estates (or shelters, if you have a significant number of Dark Ages randomizers) and 7 coppers as usual.
4. At the start of each player's buy phase, reveal the top three randomizers. The player to the right bans one card, which is removed from the game. The current player picks one of the other two and adds that card's supply to the kingdom, places the remaining revealed card on top of the deck, and then proceeds with the remainder of the buy phase as usual. Perform additional set-up steps as needed (there could be civil disagreements about what makes the most sense to do with Trade Route, though). The ban and pick cannot be skipped.
5. When ten supplies have been added to the kingdom, the remainder of the game is played as usual.