Teamfight Tactics Patch 14.16 is the first update for Set 12 Magic n' Mayhem and it is already expected to include a number of balance changes.
NEW PATCH 14.16 CHANGES! – League of Legends
Augments and Champions were the focus of the first round of TFT Set 12 Patch 14.16 PBE balance changes. Most were relatively minor, with a few exceptions like healing being removed from Karma’s spell if a unit died while under its effect. Traits like Frost and Warrior were both buffed. All of the early adjustments from Patch 14.16 are subject to change throughout the week and will be updated following the Patch Rundown.
Most of the TFT Set 12 early champion balance changes are simple tweaks. Watch out for Lillia with the High Horsepower Augment. Kassadin got hit with multiple nerfs while Briar got his damage increased.
Augments were an early focus in Set 12, from reworks to stat changes. All Augments are listed alphabetically. Reworks were applied to Assassin's Toolbox and Endless Hunt.