League of Legends (LoL) Question: Supports for season 6?

best champion in the current meta are ad assassins like zed - yasuo - talon
and the best bot for me is leona and draven - cait and nuat - bruam and lucian
even a secret bot (twitch and cass ) the posion of twitch work with cass's E cd

Soraka&Graves!! Graves' E have mr and armor boost, plus the new keystone that give extra mr and armor from heal and shield. This means lv5 E on graves could stack up to 200+armor and mr. Imagine ADC with 200+ armor and mr in 25min that build full damage and crit!!!

Leona works with mostly any adc.
Her level 3 with Lucian or Graves is really good.
Thresh is always at the top imo , provides alot of stuff.
Bard (good bards)

I personally think that the best tank supports are going to be Leona, Nautilus, and Thresh. As for non-tank supports, I recommend Karma, Nami, and Lux. They are all well rounded and fit into almost any team.