Plz take a look some unhealthy ability
Disclaimer: I'm not saying these champ are strong af but some of their abilities are fking hard to deal with
Some examples:
R - Lock down anyone with almost NO counterplay (unless you knock her away)
E - Last for fking 10 secs and it deals tons of dmg
R - point to click hard cc for 2.5sec, abused in professional plays
E - Once you are inside the cage in a teamfight (even you are not stunned), you are deleted
W - no need to explain
E/Q combo - one-shotted
Of course every ability has counterplay (dodging/ cc etc), some of them are toxic to play against as they are so strong or have limited counterplay