Do you want to know how the league system works?
Trophy Leagues were added to the game on the 17th of April 2013 in the ''leagues'' update.
Trophy Leagues are easy to understand. Every 2 weeks is a season. At the beginning of each season you must do a multiplayer attack to be assigned to a league of the amount of trophies you have. It does not matter if you win or lose, you will still be put in one unless you're below 400 trophies. When you are put into a league, every battle you win you will get a loot bonus. If you lose you don't get any bonus. The league system does not go by your level, it goes purely on the amount of trophies you have. This table below explains your loots and trophy limits:
When you are assigned to a league you are put in a group of up to 100 players of the same league as you. The badge of your league is also put next to your name in the place of where the old experience level was. Of course that has left large number of complaints to Supercell from players. They say that it is easier and better to recruit players into clans whereas with the leagues you do not know what level the player is. It could be a high level player at a lower trophy stance or a low level player at a high trophy stance.