Card game analytics: metagame share, deck-building odds, and price history, with
the math shown.
Riffle collects its own data every day: card data, prices from the stores and price sites, and
tournament decklists. A player's collection and decks go in too, so it can say what a deck is missing
and what finishing it costs.
The methods and the code are public, on GitHub
under the AGPL. Riffle is in development.