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.
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WARNING, THIS IS A GLASS CANNON BUILD. DO NOT TURRET DIVE WITH THIS, OR YOU WILL ALMOST CERTAINLY DIE.
If you're laning with another AP nuke, you should both go Will of the Ancients, and drop the Hextech Gunblade.
If the numbers on this site are to be believed, every time you get someone with a torment, decrepify, nevermore, ignite combo you deal some where around 2000. Throw in ravenous flock, and that's another 215 per second.
More to come if I feel like it