Rengar top is ridiculously annoying and kinda unfair.
The fact that he can constantly take advantage of his passive to attack you or minions is URF level ridiculous and I'm surprised it hasn't been fixed yet.
So the options here are:
- Force his passive to have a cool down.
- Force his passive to have a cool down per champion/minion. So he can't constantly target the same target.
- Remove the AOE damage that his passive provides.
and crit him to death.