Ah the classic Sphinx riddle. I couldn't resist peeking in on this item once I saw a riddle was involved. I don't know if a madlibs is the right choice for this. I can see why you are using it though because it does have the option to fill in an a blank. Maybe a survey might be a better choice for this if you are trying to get a response unless you are allowing for different variations. You also need to setup / add to the part of speech blank so that readers would be able to fill in the response. In It is a fun idea though. As I'm not sure this is completed yet I'll give you a 5 for concept as I may be reviewing this early. Good luck with this mad lib!

(Earlier version forgot to explain this was an anniversary review)