Just an unlikely idea
I know this would probably be tricky to code, but I wish for vs.cpu you could build a deck for the cpu to use.
That way when inevitably the cpu decks get beat by dlc additions (or you want you practice against a rideline that a cpu doesn't use) you can still add some challenge/variety.
I don't know how coding works.So I have no idea if that would even be possible, but I think it would be pretty neat!