I run a league (complitely free!) from 12PM to 3PM every saturday. League members play games and get one stamp (10 points) for playing a game, and an extra stamp (10 points) if they won the game. Every league member has a card that I stamp after every game they play. Every 150 points they get a POP2 booster pack, and after 600 points they earn their current season badge. The stamp amounts per game should be the same for every league.