Janna; The Immortal
Janna has literally been played in every single major tournament I have ever even slightly watched.
She has suffered nerfs over and over, every year without fail.... she is a perfect example of reverse power creep; 100% of her abilities have been gutted more than once (Ex: Ult used to stun longer/slow over time, shield used to last 10 seconds and had way better ratio, etc.)
And yet I foresee MORE nerfs in her future. Will they hinder her ? no, because she is Janna; The Immortal.
She will never stop being Janna.
as having the strongest nerfs though.... (given his release it was to be expected)