Play games
Choose the game that interests you and play itfor free.
Complete the quests
Every game has some quests for which you will receive Soul Gems.
Receive rewards
You can exchange your Soul Gems for Steam Wallet top-ups, game keys, CS:GO Skins and other rewards.
How can you prove that you actually have a champion with 5 stars? Is there a screen where both your account's name and 5 star champion are visible? If so, where?