Create magic.
The starting point for creativity should be the effect -- what you want the audience to see and experience. Then you figure out a method to get there. Starting with a method or plot is backwards. It sounds like you are creating just to create something.
Typically, when I see these sorts of posts, I get the sense that the person posting doesn't have the experience or knowledge to "create" and is better off spending their time learning. I see these types of posts like a medical student after one month asking, "which organ should I figure out a new way to replace on a person -- a heart, spleen, liver or bladder?"
I'm going to guess that you've been doing magic less than two years, don't have any books on card magic (maybe RRTCM or EATC and one more that you haven't read), don't have Giobbi's Card College series and can't tell me about more than two of the following: John Bannon, John Gustaferro, Simon Aronson, Woody Aragon, Juan Tamaritz, Auturo de Ascanio, Larry Jennings, Brother John Hamman, David Acer, Tommy Wonder and Tom Stone.
I'm not wrting this to discourage you from creating, but to encourage you to learn more about card magic before you try to create something that most likely was already created.