Fonts and sizes for cards games

Hi, everybody! (Sorry for my English) I'm working on my first deck game. It's suppossed to be a short and fun game about defeating the other players by making it difficult for them to achieve the one and only objective everyone has in common and, I'm transitioning from pen and paper to digital art.

I have Arial placeholders and I would like to know: which fonts do you think are fun and can give some sense of danger, backstabbing, laughs and maybe treason? Weird question I know xD

And other thing, I'm settling on my font sizes. I have some cards with descriptions that vary from 2 to even 5 lines. By now I have a placeholder of a gray/transparent box over the drawing. Is it okay to resize the gray box depending on the description? Or should I change the font size to fill the box? I want to know if I should prioritize the gray box size or the fonts size

Again, sorry for my English and If I'm not being clear enough with what I'm asking