Is Assasin kayn balenced ?

i personally think that assasin kayn is unbalenced i saw soo many one shots with kayn and i dont think kayn got much counterplay . i would like to see some nerfs on assasin form even when kayn doesnt have the highest win rate i personally think he needs a nerf lots of champs who doesnt have a high win rate get nerfed so why doesnt assasin kayn get one
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