Certain compositions are proving overly dominant, prompting Riot to address balance issues in Teamfight Tactics.
Idol Worship
The Idol Worship composition has been formidable since season 6.5, receiving indirect buffs from Riot. Notably, achieving a 3-star Idol has become significantly easier with units like Senna and Gnar. This enables reaching the 3-star milestone as early as level 8, empowering a primary carry substantially. Irelia, in particular, is excessively potent in the current meta.

Another factor amplifying the strength of the Idol Worship composition is Gnar's affiliation with the Vanguard trait. Thus, having both units on the board ensures Irelia deals devastating damage, escalating over time as higher Idol milestones are reached. Perhaps Riot Games needs to slightly nerf the Idol milestone bonuses, especially the first two activations, for better balance of their power.
Challenger Mode
In essence, the Challenger effect itself isn't overly potent as it requires your champions to defeat opponents to gain increased attack speed. However, the strength of the Challenger composition lies in possessing numerous powerful carries, evenly distributed from early to late game, making this lineup very resilient. You can even reroll with a Challenger team early on to push Warwick to 3 stars, and that unit will carry your team until the late game.

Therefore, it would be reasonable for Riot Games to reduce the damage output of 2-3 gold Challenger units like Warwick, Quinn, or Tryndamere. Not to mention, Warwick's excessive healing capabilities also need some adjustments for better balance. Additionally, the bonus attack speed at 6 Challenger should be slightly reduced to prevent this lineup's skirmishing prowess from becoming overly dominant as it currently stands.
Innovators
Despite continuous nerfs, the Innovator composition remains excessively strong, evidenced by its numerous variants consistently topping the Teamfight Tactics meta. You can combine Innovators with Jhin, Twitch, or Irelia as the main carry depending on the game's circumstances. In luckier scenarios, players can even elevate Seraphine or Jayce to the carry role. In summary, Innovators are currently a very potent lineup capable of performing well in every match.

Naturally, such a strong lineup will need to be toned down. I think Riot should add a bit of energy lockout time for the Tech Bear or make units take longer to cast their abilities. The ability of the Tech Bear to cast skills too frequently in combat provides the lineup with an excessive amount of attack stats. Adding a delay to ability casting will make the Tech Bear more susceptible to being countered compared to the current situation.
