In the eyes of the competitive community, Teamfight Tactics has some compositions that are extremely disliked because they are too “cancerous”, too annoying, or too difficult to counter. Moreover, these compositions have maintained almost their full strength even after being nerfed by Riot Games in patch 10.13.
Here are those “cancerous” compositions:
“Master Yi Laser” Composition

Although rolling for a 3-star Master Yi is not easy, even a 2-star Master Yi can cause many compositions to “die off” in several rounds. With just one Infinity Edge item, Master Yi can carry extremely well in the early game. By the mid-game, if equipped with 2 items like the Cloak of Agility and Guinsoo’s Rageblade, it becomes very difficult to stop this 3-cost swordsman.
As for other champions in the composition, Zed is also a strong carry champion and fits well with the Duelist activation, as he can also trigger the Rebel effect for Master Yi. If you don’t have the Blade of the Ruined King, you can temporarily replace Fizz with Fiora or Xayah to activate 6 Duelists.
In patch 10.13, Master Yi’s skill damage was reduced from 200 to 175 at 3 stars, so the community believes that a 25 damage drop is not enough to remove “Master Yi Laser” from the top meta compositions. Even the nerf to the 6 Duelist activation rate from 70% to 65% is not substantial at all.
Star Guardian Sniper Composition

The community is “sick of” this composition partly because Teemo is “just annoying to see”, and partly because Teemo’s power is too hard to counter. With just one Blue Buff and Star Guardian activation, Teemo can continuously spam his skill. If he gets an additional damage boost from 4 Snipers and a few ideal items like Morellonomicon and Rabadon’s Deathcap, it becomes extremely easy to pin down and eliminate short-range champions with Teemo.
In patch 10.13, aside from the slow duration being reduced from 4 to 3 seconds, his skill also had its satellite damage reduced by 50 at 3 stars. This makes the “Teemo-hating community” feel quite unfair, as once Teemo reaches 3 stars, “one skill equals one kill”, and a slight damage reduction like this is negligible. The nerf to the slow duration is even more unreasonable since Teemo can use his skill under 2 seconds, and enemies will be slowed continuously as long as Teemo is alive.
Cassiopeia Vanguard of the Mysterious

Many players share that in ranks Diamond and below, there are plenty of matches where the top 1-2-3 all play Cassiopeia in the Vanguard of the Mysterious or the Keeper of the Mysterious compositions, making these matches quite boring.
Regarding the strength of the Vanguard of the Mysterious composition, it boasts a very sturdy frontline with a bonus of 300 armor and 120 magic resist. If Jayce has the Dragon’s Claw and Guardian Angel, defeating this champion will be a tiring task for the enemy team, not to mention the champions behind him. As for Cassiopeia, with an item combo of Blue Buff, Morellonomicon, and Infinity Edge, she will stand in a safe corner to continuously spam skills and eliminate opponents.
In patch 10.13, the burn duration of Cassiopeia’s skill increased from 12 to 14 seconds. This means that the damage per second will be reduced from 58.3/125/250 to 50/107.1/214.2. However, the community believes that Cassiopeia will still be powerful with that damage combined with the true damage from Morellonomicon; this nerf is essentially not enough to diminish Cassiopeia’s popularity in the meta.