The beauty of cards is that they can be anything. You can slap together a working game with them in a couple of minutes. Take 12 blanks, doodle some faces and landscapes, and lo, you have a procedural narrative generator. Make some duplicates, invent a few rules and lo, you have systems.
Conversely, the great drawback of cards – especially in those roguelite deckbuilders people have been churning out since Slay The Spire – is that everything can be reduced to them. For example: last night, I played a round of Fungi with my partner, Fungi being a charming tabletop foraging sim in which you gather scrumptious chantarelles and boletus from the forest floor. This morning I resumed playing Breachway, out now in early access, in which you guide a starship through a series of wartorn solar systems, with battles unfolding as a turn-based exchange of cards corresponding to ship components.