Assassin/Ninja Help 90-100 Air Assassin

The title (kind of) says it all, but it's going here anyway.

I am in need of a level 90 Air build, of which can last me until level 100.
I'd ideally like a fast character with medium - high damage, and good Agility.
I'd also like decent Mana Regen for spells, and some spell damage for spins and bombs.
I don't really mind what items I end up using, but please use Mountain Spirit if possible.

Side note: If there are any items I should replace as I level up, please say :D

 

Spectre/Cumulonimbus
Booster Plate/Boreal-Patterned Aegis
Crystal
Ventus Tail

Concentration
Concentration
Squid Anklet
Royal Cyclone Amulet/Bottled Thunderstorm/Windy Torc

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Keep in mind that this build has no sustain in terms of hp regen or lifesteal.
So you're gonna have to carry health potions with you.

 

For skillpoints:
1) Put 35 in dexterity
2) Put 50 in intelligence
3) Put 50 in agility
4) Maximize your intelligence
5) Add additional points to agility as you level up

 

Please do not do this.

The amounts of intelligence that matter are 41, 47, 68, 106 and 129. I'm not entirely sure how they affect assassin's spell costs, though. There is a thread about it somewhere.