personally I got pretty lucky putting 40 rolls into the first card banner and I've just kind of been coasting off of that, usually takes me a couple tries to get through a new uma's goals but I'm able to pretty consistently get normal endings / finals wins after figuring the game out a bit more. I might roll a bit on cards in the future if they interest me enough but for the time being I'm just going to focus on umas from here on out. Either way the campaign seems very consistently doable without super meta cards as long as you have a decent strategy