Unstoppable Winds

Okay, so this is my first guide on here, so hopefully it doesn't suck.

This build may seem expensive, but it is worth it for Arena and achievable with how quickly Kuku can clear minions (I have not tried this build in Joust or Conquest, so if you try it there it may need some work). Yes, this build may seem like stacking overkill, but the end result is devastating.

The order for the first three items is VERY important. Because of Kukulkan's passive, you want his mana as high as possible right off the bat. The Shoes of Focus help with this immensely plus prevent mana starvation.
Second, Warlocks Sash gives you sustain with the massive amount of health plus the additional mana, in addition to the magic power stacks for clearing minions (which is no problem with Whirlwind)
Third, Book of Thoth is a must. The passive on this item combined with Kuku's passive is so important, because at the end of this build you should end up with well over 2500 mana.
Polynomicron is where it gets fun. You will be able to lifesteal minion waves so quickly your sustain will allow you to stay in the fight way longer with Kuku, and then just use Slipstream ability to get out.
You can build Soul Reaver or Rod of Tahuti interchangeably, but I typically go Soul Reaver first.

By the time you finish this build with all the stacks, you should have about 160 magic power from Kuku's passive and a total of 1000+ magic power. If you need that Dragon's Wrath award for a one-shot kill with Spirit of the Nine Winds, this build is probably going to be your best shot at getting it.

Let me know what you think, feel free to leave comments for any adjustments to skills, items etc. As I said, this is my first guide so it probably needs some tweaks.