The truth is that after being nerfed a bit in the November 20 patch, Katarina is still an extremely powerful main unit.

However, the truth is that the frequency of the Katarina squad appearing on the Korean server (especially high ranks) is extremely low compared to other regions.

First we need to mention the counter lineup options for Katarina.

The two formations often used in this situation are 6 Challengers and the main Lissandra.

In the case of the main Lissandra team, you can aim to activate the Chemical Technique clan to get the damage reduction effect and help this unit withstand better.

As for equipment, the Gai Cloak is an indispensable item when facing the Assassin team in general and Katarina in particular.

Another way to counter that you can apply is to choose hextech upgrades like Doc Hanh and Homemade Armor.