We need item that counters shields and any kind of buffs.
An item that targets an enemy champion and makes him immune to any allied buffs like shields, heals, Lulu ults, speed ups etc.
The amount of counterplay there's to a comp with shields is non existent. Maybe there could be a debuff similar to griveous wounds that applies for shields.
Riot mentions counterplay every single moment they can but for a tank/assassin that wants to kill a target he has to deal with shields, heals etc with no way to stop these, if said champion could build an item that made his target immune to those we might even see some champions become more viable.
Can we have a Home Depot Yorick where he hits people with counters...?