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 figure to ask this questions since I can complete a base icon pack but because TOTY is right around the corner and Mid icons are out I'd love your opinions on what to choose, save or risk it on the base icons. Thank you!