Quicksilver Sash. It's effects should be swapped with Cleanse. (Not Cooldowns.)
Quicksilver Sash removes suppression and all other cc. On a 90s cooldown. For 1550 gold.
Why the hell is this allowed? Then the champion can build an AD item out of the QSS, and not lose any damage because of it!
I'd rather force the enemy team to pick a summoner spell
on a 250ish cooldown in lobby to counter me, than for them to pay a MEASLY 1550 gold to render a champion obsolete.

Post your counterarguments. And I'll quote you in this post and explain why you're wrong.
So you want those champions to be rendered useless by a single summoner spell?
I think this idea is just... I don't even know what to say.
How difficult is to just spend 1250g on a single QSS? Yes you will probably have to delay your damage and this item will probably not be useful otherwise, but that's the fucking trade-off for being able to survive those champions. If there were no QSS, they would be too powerful; and if other CC removal/reduction sources could affect suppression, these champions would be useless.
It's like when you are against
as an AP champion. He forces you to buy Zhonya, yes. However, there isn't any problem with that. It's just adapting your build to a situation, you don't have to build the same things on every battle.
I don't think you understand. I HATE QSS. It's too GOOD of an item. 1250 gold counters a champion entirely on a NINETY SECOND COOLDOWN.
I want these champions to be countered by a 250s cooldown rather than a 90s cooldown. You mentioned Zed.
can be countered in lobby by selecting Exhaust. Exhaust is a 250s cooldown spell. Zed's ult is what, a 90s cooldown? That means Zed has a 160s window in which he can function without worrying about exhaust.
SUPPRESSION CHAMPIONS HAVE NO WINDOW. QSS IS UP EVERY SINGLE TIME YOUR SUPPRESSION IS UP.
On the subject, Zhonyas is OP and should be removed as well.
too and I am not asking to remove her.
If you remove Zhonya, those champions will be rendered weak or useless. If the champions are broken due to their synergy with Zhonya, just nerf the champions themselves, not Zhonya.