Below are some campaigns from Canon, Nike, Levis & Dodge that I think emoby the spirit of the message you're trying to get across with "League of Champions". Each have their own way of saying it but they all represent being great, getting inspired, seizing the day or in your words.... being a champion.
I laid out print and video campaigns from each of the companies for us to get inspired by their messages. The most important thing I think all these share is that each of them is telling a story.
I think if we tell a compelling inspiring story of either a "day in the life" of a champion or the journey to becoming one. We take a whole week to shoot with different subjects capturing moments in time that makeup a champions day-to-day. We do this, it could be something special to add to all of our books.
Sidenote: I think most of these campaigns were created by Wieden & Kennedy.