Jesus Christ, these champions have been rampant for months. They are picked semi-regularly in pro play with good results, and have been sitting at stupidly high win, pick, and ban rates in solo Q for a while. Vayne is currently #5 in win rate, #2 in pick rate, and #1 in ban rate. Riven is #2 in win rate, #1 in pick rate, and #7 in ban rate. If these were any other champions, they would have been hard nerfed by now. But since they are the poster girls for LoL, guess they will stay dominant.