You mentioned previously that complexity creep was an issue with continued expansions. I am curious how you would approach solving that problem.
I would like to make it clear that I am not trying to get you to reveal any information about future potential expansions. It is more of a theoretical question about how to continue to add to a game without it becoming overly complex and presenting entry barriers to new players.
For Dominion the solution is to make spin-offs instead. Suddenly you can make very simple cards again.
Complexity creep is less of a problem when your game is more complex. Magic is crazy complex, and so you can make a huge number of very simple cards; with tens of thousands of cards over 25 years, they haven't done e.g. "destroy target tapped artifact." Complexity creep is also less of an issue the more redundancy is okay.
Dominion is very simple, and I decided to try to avoid redundancy, and so there aren't very many simple cards to make. At the same time adding complexity is a panacea, it solves all of your problems except increased complexity. I labored to reduce complexity in Empires and well there it is. So I mean. How would I approach solving the problem in Dominion? With the healthy attitude that it will be okay to fail.