There are so many things a good API would have to do... Different types of decks, handling of a discard, shuffling a card into the deck, shuffling the discard

There are so many things a good API would have to do... Different types of decks, handling of a discard, shuffling a card into the deck, shuffling the discard pile into the deck, handling hands, milling a card from the deck, multiple decks acting as one... Though the simplicity of this api currently just having a deck that you take cards from is neat.