I'd like to add a suggestion as well. Why write on the joker card at all? There is no typography on any of the other cards and I think it's quite obvious that it is the joker. I like the clean design of the other cards with everything incorporated. The letters on the joker card a just not as homogenous, but designing a font would be a bit exaggerated. And there are already four different fonts on the front cover. A fifth that only appears on one card is quite much.
From the "not more than two fonts" media designer.
No more than two fonts is totally correct and it will be that way. Right now I am in the process of typesetting the cards and the Joker font was already marked as an issue. Probably I will not remove or replace it but maybe it's going to be plain white.