Champion Concept: New Type of Supporter

I had those thoughts in my mind now for a while. I am thinking about an ultimative support Champion. One, whose normal "Attacks" doesnt damage enemies, but heal allies. His Abilities would be like Healing, Shielding and i think something to get away from enemies for you cant kill them when they chase you. The Ultimate should be some kind of Saviour from Death like with or . The Idea behind this Concept is a champion that isnt able to deal damage, but is preventing his whole team from falling. It should be a higher being like an angel or a good ghost with high mobility, but not much durability. It should be made for staying even behind the backline to just keep the backline alive. The real balancing i leave up to you for im not too good with that. I think a supporter like this would give the whole game a new direction and would be an interesting new mechanic to try.