Community-Revert the vayne buff, it set her over the edge.

Vayne is probably going to remain cancer as long as her kit exists in the current way.

On top, I did not think that reverting the Q buff would instantly kill Crit Vayne - her kit has far too much synergy with it (freaking AD steroid on ult and Q essentially rising your AD for the next auto-attack to 1.3-1.5 times its value), and Warlord's Bloodlust (the mastery enabling the build by allowing Vayne - and Twitch, for that matter - to forego early lifesteal) was not changed.