I think that 'Dumb' in this case is more likely to represent the fact that the cards themselves don't do anything. They're 'Dumb' in the sense that they're much

I think that 'Dumb' in this case is more likely to represent the fact that the cards themselves don't do anything. They're 'Dumb' in the sense that they're much more inert by themselves than say a video game is. I think games like this encourage imagination as basically a prerequisite to play, whereas video games are almost the opposite.