Anti-Rengar Marksman Item

So as a Rengar main, everytime i one-shot a poor adc in the middle of their team before a teamfight I think about how little counterplay there is (which is why for the upcoming assassin rework Rengar is top priority). I think adcs need something to counter oneshots just as the mages have zhonyas. Although there may be problems i was thinking along the lines of an item with attack damage and life steal (or whatever) but more importantly an active that reveals stealthed targets near them and silences them for a period of time (was thinking 1.5-2 seconds) on around a 110 second cooldown.

This would allow for more counter play against rengar players and also force them to build cdr so that their ult comes off cooldown and gives a small window of opportunity to kill the adcs while the item is on cooldown.

Also, it would add counter play to other stealth champions like twitch and kha'zix as they can move out of the range of the item as rengar is the only champ with the (!) above peoples head to say that he is near.

All thoughts are welcome.