Thanks for advice and +1, i'm going to re-work this guide a little later today :)

+1, but take my comments into consideration ;P Sorry for double post.

This resembles my Soraka build a bit from the items section, I also think Mobility Boots, Morello's Evil Tome and Shurelya's Battlesong are good items on Soraka. However Archangel's Staff isnt,
1. Tear needs to stack a long time to actually give AP so no use to get it as a last item, there are better items for Soraka
2. You don't need that extra mana regen given by Archangel at that point

You should pick 1 point to Starcall a bit earlier than that, because it is actually quite useful on teamfights if your team has mages.

About runes: I don't think you should pick full ap scaling runes, maybe flat AP quints and marks and glyphs can be both ap scaling to max out the effectiviness, like that previous commenter mentioned.

Also, pick an escape skill? Fortify is a great spell, but Soraka without flash = dead meat.

Thanks for +1 and advice :) of course I will. I've been working on this guide only today so i'll add much more stuff into it including maps and some screenshots and i will make some changes.

I feel you should take your Philo stone earlier, since it give you a MUCH bigger advantage earlier on, more GP5 and it helps your laning!

I'd recommend flat AP Quints. Flat AP quints give 4.5AP, scaling give 7.7. In short, for the majority of the game you'll have higher AP with flat.

Flash is NOT bad if you have good positioning, there's a reason that a lot of top tier games have all 10 players with Flash!

For masteries, take Good Hands. Perseverance really doesn't do that much at all (I don't have the maths at hand, but I assure you, it's a minuscule ammunt) - and Good Hands can save your team's *** late game!

Other than that it's a pretty good guide - only thing I'd advise to add is some locations to Clairvoyance, too often I see supports wasting that summoner spell...

I hope you take my comments into account :)