Greetings,
Are you familiar with Unity for game development? I believe developing within unity using scriptable objects would be a prime solution for a gaming app of cards as once set up that would allow easy card creation and drag/drop to populate the images/etc. Do you have a list of the game mechanics? I would be very interested in hearing more about your vision for this game app.
I look forward to hearing from you soon.
Thank you,
Kyle Hunt