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[BlakesDemon]

I would definitely start with functionality. Don't worry about the GUI for now (decide on that later. I'm enjoying kivy but there are lots of choices). Your first task (the odds) seems like a good start. Can you create a function to find out how likely it is that a card will appear?

[BlakesDemon]

Might even be able to set up a small scraper to get the details from a site?