40-cards mode seems not worth implementing. Since players have only one city per civ on DE (which is amazing), I don’t know how this could even work (deck types…?).
All-cards mode actually seems more reasonable to implement and even makes more sense I’d say. A limit as high as 40 is not really meaningful anyway.
It would still take some work to implement a functional UI for it, but it wouldn’t require design changes affecting other existing parts of the game.
Actually makes me think of an additional “random deck” mode, where you just get assigned a randomized deck of cards to play. Could be fun to see players forced to utilize some of the unusual cards in the game.
To be clear, I still don’t have super high hopes of either mode being very popular, but if enough people like the idea and devs consider it worthwhile, perhaps it could happen.