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.
I think this is cheating and a really bad thing, becouse if you are laning against enemy who doesn't have scripts, you will just simply win, becouse you will hit way more skillshots and dodging will not be issue anymore. :/