Will of the Ancients grants a Unique aura: "Grants nearby allied champions +30 ability power and +20% spell vamp."
Do Auras apply to ones self as well as to others?

Should I try out experimental builds in blind normal games or in Coop-AI games? Thanks

Can't answer #1 but I'll answer #2 for you chopinator.

I prefer to do builds in normal games (as I assume most others would or would want you to).
Reasoning behind this is you can get a better grasp of it and if it falls apart and your hero
ends up being worthless, it will not bring down the rest of the team. You can google "[Hero] Build guide" without the apostrophes and replace [Hero] with whoever you want and it will usually be first website up that will already have a guide to it.

You can look and tweak as necessary.

yes, you get the benefit from the aura to "near by allies", it counts you too.