Disclaimer - I only included champions that recieved VGU's since i started playing the game and I only counted what Riot defined as a VGU. This also means that gameplay updates don't count like Sejuani's second update which added her New W since that is considered only a gameplay update.
S Tier - Sion
A Tier - Akali, Poppy, Nunu & Willump, Gangplank
B Tier - Aatrox, Urgot, Warwick, Tristana, Soraka, Shen, Ezreal, Maokai, Nidalee, Ashe, Heimerdinger, Twitch
C Tier - Irelia, Swain, Evelynn, Fiora, Miss Fortune, Sejuani, Trundle, Sivir, Annie, Katarina
D Tier - Galio, Taric, Viktor, Quinn, Garen, Sona
E Tier - Master Yi, Kayle, Ryze
F Tier - Yorick, Karma
If you wonder why a have any particular champion placed in a certain tier let me know and I will explain. I would love to hear others opinions.