Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
This is the Soraka build that I've compiled over the last 6 or 7 games that I've played. First and foremost, item build always changes depending on the enemy, their strengths and weaknesses, and you're fellow teamates. I like to start with Mana Manipulator. This should be obvious, and one thing to throw out there, if you ARE playing arranged, a great teammate to lane with is Shen. He's overwhelming with this Soraka build. Try to lane with someone that doesn't require mana, which will save your Infuse all for yourself, or giving you a chance to throw more silences to the enemy. Skill points alter between Astral Blessingand Infuse andWish until level 12. I don't put any points into Starcall until the very end, because it is very useless early game. However, it is your money maker, and potentially a great magic reduction towards the enemy. This is why I have Magic Penetration runes. The late game Starcall will devastate team battles. Boots of Mobility are great for Soraka because the faster you get to the fight, the better. Next is Zhonya's Ring. This will stop the initial burst damage that the enemy tries to apply to Soraka. Pop Wish as soon as your buff is up (2 seconds). The rest should be taken care of, if not, Ghost out of there.