Three ways into a game: send a friend a link, queue on the ranked ladder, or play offline against a bot or a second player on this screen.
A game against the bot needs no account and starts in one click. Ranked play needs a free account and pairs you with the closest opponent by rating, and both players accept the match before it starts.
Every card in the pool is automated, so abilities, triggers and reaction windows resolve themselves. It runs in the browser, on a phone as well as on a desktop.