What if... when you hit Rengar with non-displacement-hard-CC during his passive/Ult leap...
With something such as a Lux snare, he didn't proceed to oneshot your ADC and instead got snared in place.
Sound good? Sounds good.
Look people, we're obviously not just gonna slap this massive nerf on there and call it day. He should get compensation buffs for this change. The goal is to make the champ healthier, not gut him.
Now that there's more counterplay to his shenanigans, the shenanigans itself has room to be stronger since it's counterplayable.
Make sense? Makes sense.

,
,
,
,
ect.
, then it just seems Very biased against him.
Thats like saying. HE gets Bonus 300Dmg To any champion that has a CC that could have stopped him.
and
ect(just a few Whom can interrupt
,
are common ones adc use.
There just isnt really an Item that does "Stop any burst from happening to anyone"
has rengar like play style, and has a spell shield, and you cant interrupt his R movements, and shuts down any vision you did have.
... and that item is pretty broken. Free damage from stealth, has a slow for him.
R stop champions mid dash.