Everytime there's an enemy Kai'sa on the enemy team, she 1v5 carries.
Like this shit is Vayne 2.0, she's terrible in laning phase, but is just God mid to late. I really don't understand why you can't build against her because of her passive, she get's bonus isolation damage, self peel, invis with a shit ton of movement speed, a long ass ranged nuke ability, a large ass shield, a large ass dash, and 50 fucking viable builds that are all absolute cancer to play against.
Seriously though, ever since this champion has been released, she's been nothing but a god damn problem. Why hasn't she been nerfed?

( my personal build )
and
for armor
and
for penetration
and
for CC