Riot's answer to vayne being underpowered:

Revert an old nerf done in season 1/ season 2

then let's do it for every adc? revert nerfs that are now out of context

W damage reverted to 280, his W was op because it used to slow attack speed, riot nerfed the damage and THEN removed the attack speed. is already played in LCS ulti damage nerf at lvl 6 reverted, there is now better lane bully than corki (hello ) and his flat armor pene is being replaced on PBE. R maximum mana cost reverted to 200 instead of 400 , AP kog is dead, this nerf was done when froggen abused AP kog in competition. R Duration reverted to 7 seconds instead of 5, no idea why the fuck it was nerfed during the marksmen rework.

are already fine.