[Rework Concept] Making Soraka the support she deserves to be.

Soraka is not in a good place as a support. Mostly because Riot doesn't want to make her a dedicated sustain champion because it would make the lane boring to play and watch, something I agree on. But that doesn't mean she can't be an amazing defensive support, you just have to make it so that sustain has some kind of drawback towards Soraka herself. That's why I've created this concept, which essentially makes Soraka a martyr, a fantasy of sacrificing yourself to save others:

Soraka, the Martyr Starchild

Passive:
Soraka's health and mana restoring abilities are 1% more powerful for every 5 AP Soraka has.

Q, Starcall: Range: 750, Cooldown: 5, Cost: 60/70/80/90/100 mana
Soraka summons a star that falls at the targeted location, dealing 60/95/ 130/165/200 (+ 60% AP) damage and reducing armor and magic resist by 10/20/30/40/50 for 3 seconds to all enemies in a 200 radius.

W, Astral Offering: Range: 750, Cooldown: 10, Cost: 15% of maximum health
Soraka drains 15% of her maximum health to restore the same amount as health to the target ally. If her health is below that percentage, the cost will be reduced so that she is left with 1 HP after casting the ability.

E, Infuse: Range: 750, Cooldown: 10, Cost: 5% of maximum mana / no cost
Same as before.

R, Sacrifice: Range: 2000, Cooldown: 150/120/90, Cost: none
Soraka protects an ally and recieves all damage the protected ally would recieve for the next 4/5/6 seconds.

So this is my take on how I'd like to see Soraka. Please, feel free to suggest any changes you'd like to see or other possible kits for Soraka. :)