Martin
A monoid in the category of endofunctors
I’ve not, no, but it sounds quite fun.Have you played this:
https://boardgamegeek.com/boardgame/141572/paperback
by chance? It's like a weird Dominion word game that makes this exact pun on a lot of its cards. You basically buy letters that are both money and actions and you can only play the cards in your hand that you can make a word out of.