I've had a kind of anti-experience with my Wild Mage player. He'll use his Tides of Chaos once for the advantage roll... and then avoid casting any other spells except cantrips to avoid setting off a Wild Surge and getting his ToC refreshed.
Weirdest play style I've ever seen...
The D100 roll is triggered by the Sorcerer using a spell of 1st level or higher; RAW, cantrips cannot cause Wild Surges.ToC: use, then DM can roll on the D100 table or not.