@Riot How About an Anti-Shield Ability?
I've had this idea for a while now but why not give a champion, preferably a support, an anti- or inverse-shield ability? As the name implies this ability would do the opposite of a shield and do damage, looking something like this:
'Anti-shield'- After a delay, Caster places a shield on an enemy champion that absorbs healing and shielding affects and does bonus damage at the end of the duration based on heals and shields supposed to be received + Caster’s AP.
Ideally it would be a direct counter annoyances like 
and 
who spam healing without forethought or for dealing with champions that simply refuse to die 
and
.
Of course the ability would have its downsides like:
- A cooldown similar to Yasuo's WindWall or even just be made an ultimate ability itself.
- Being able to target only one champion.
- Short casting range.
- etc.
Thematically I think it would work best on a witch doctor or hex, character.
shield will still only last two seconds at best or 
who ordinarily doesn't have strong shields to begin with, though each shield lasts three seconds.
is getting 
shoved down their throat, you aren't going to wait until they all wear off cause your whole team would be dead. You just cant blow ur CC, threaten then to the point where they'll use the heals/shields while staying safe from an engage, then re-engage.
would have an easier time diving 
? and 
other healing/shielding champions.