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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
You'd probably have to create a few other classes for handling things like the game, the players, etc; and you'd just use this class as the deck.
How would you go about making this into an actual card game?