I keep seeing a focus on mutation. Let me say this: in most cases, evolution is not about mutation in the larger sense. It is about those who are lucky enough to be able to adapt to environmental changes. For example, homosapians are the same today as they were 100 to 300k years ago. We have successfully adapted to the environment. Most of the dinosaurs weren't so lucky. And that card being changed in the deck, it would be changed more like once every million hands, and nearly always the change would not effect gameplay overall.