Invulnerability Buffing Support Champion

This isn't me giving an idea of a champion, just an idea for one. I'd like a support champion who has zero damaging spells, whose abilities include ways of making himself/herself and her allies invulnerable. Maybe this champion could have a spell that made it so allies could click on a certain target champion for a short period of time, making it so this ally can't be auto attack and clicking spells don't work. He could also have an invisibility spell and a spell that causes skill shots to go through his allies. It'd be cool if this champion had a skill shot ultimate that once it hits an enemy (or enemies) It can cause each successfully hit target's summoner's screen to flash a solid color so they could see to attack or to avoid attacks. Maybe you could take each of these ideas and put them on different champions, they don't have to be supports. I was just putting a small concept up in case you hadn't already thought of these things yourself.