The New Way To Carry
Probably the safest and most successful build I've seen on here. 200+ ranked solo queue games as Raka and ended D5 Season 6. IGN: Homie of Harambe.
Now I've seen many people using Soraka and running the mastery Perseverance in the resolve tree. On paper it looks way better, but with the health regen seals it becomes too much and your mana regen won't be able to keep up. Plus it is much better to have shorter Summoner Spell Cooldowns with Insight and Ionian Boots