The Power Leaderboard ranks all players on the server according to their Power. Power is a measure of how good you are with a champion.
To access the Power Leaderboard, first tap "Rank" on the main menu.
Then tap "Champion" at the top of the menu on the left side of the screen.
In order to qualify for the Power Leaderboard, you must complete at least 20 matches with a single champion. Each champion's Power is measured separately, based on the matches you have completed with that champion.
You can view your champions' individual Power rankings by tapping a champion's portrait at the bottom of the screen.
You also have a general Power score, which is calculated based on the Power scores of all of your champions. It is not the sum of all your champions' Power scores combined, so if you notice that your champions have higher Power than your general Power, don't worry! That is normal.
You can view your general Power ranking by tapping your profile image at the bottom of the screen.