New late game support idea

Q: Creates a banshee veil on an ally for 2 seconds. 30/25/20/15/10 second cooldown. Long cooldown at the beginning so it's fair. W: Shields aoe for 20/40/60/200/300 (1.0 AP ratio) This is crap early on but as the late game comes in it's fair. E: AoE 80% slow with 20/40/60/80/100 damage (.8 AP ratio) R: Heals all teammates in 1000 range for 50/100/500 health (1.0 AP ratio)

All of these are support like so that's a good thing. Utility is highly regarded in this kit, there is one damage move. The values on all of the moves start out CRAP but scale HUGE. I want a good late game support that can affect a whole teamfight not just one cc move or one aoe move.....