In One Deck League, up to five players join a football league before the final three weeks of matches are played. Based on the current standings and remaining fixtures, players must predict which of the eight teams will win the league and place bets on the outcome of each game.
Matches are played by drawing cards from a shared deck, which players help build by contributing their own cards. Players can use their cards to make additional predictions or influence the results during stoppage time. The player who earns the most rewards is declared the winner.