Probably an odd question since this is a pamphlet jam, but the first thing I came up with when I was thinking about this jam the other day was a tiny card game about dueling beetles. And so I've spent the last few days developing and playtesting this card game with my 7 year old. The whole game is 20 playing cards.
Not exactly compatible with TTRPG, though a clever DM could integrate it to make combat quite a bit different.
