Reverse Three Card Monte

About six month ago I came across a principle that would allow me to do a reverse three card monte, or I guess it’s technically a divination effect. I rip off three corners of a playing card, so two have indexes and one doesn’t. They are mixed up by a spectator with my back turned and I always know where the odd one is (non index corner). It’s a good puzzle, but not a good trick. It’s missing a lot, mostly an ending. I think it’s a good 3 am magic trick at a magician’s convention.

Here’s me doing it for another magician:

I’m not sure what I want to do with this. I’ve put some energy into trying to make it more than “you mix them and I tell you which one it is“, however I’m thinking that might be what it’s destined to be.