I feel like Sivir was balanced and still got huge nerfs to her kit.

A champion with a low-damage poke, a W that doesn't change how much damage she does AT ALL, an ability that blocks a single enemy poke with an absolutely horrible duration, and a small team-boost as well as a small attack-speed boost that lasts such a short time you hardly notice it, yet the two main things in her kit (attack speed boost, spell shield) got these gigantic nerfs for absolutely no justified reason. Increased the spell shields cooldown by 8 seconds, probably the biggest nerf any ability has ever had before, completely ridiculous. And then her attack speed boost didn't last for a set time, oh no, it lasts for THREE ATTACKS. Jayce has the same thing in his kit for except the boost is three times as effective and it literally amplifies the damage his autos do at later ranks. And then sivirs, which was balanced if not underpowered, gets -20%. These nerfs were ridiculously large and unjustified and I hope are reverted soon.