Astral Infusion should not cost health (Soraka)
Astral Infusion should not cost health (unless Soraka was a valid target for it/able to cast it on herself) that Starcall/Starfall does not effectively make up for...
the point is that Soraka is more dependent on Item Builds, Runes, Masteries, Summoner Spells (AND her own ultimate ability) than the majority of available champions at large; making her Tier far lower than her measured difficulty projects.
the simple solution would be to make Soraka a valid target for her own Astral Infusion.
the ideal solution would be to remove the health cost.
if healing costs the healer their own health, then they're not quite a healer.