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.
I know this has got to be the dumbest idea of a build but I tested it against a 5v5 practice game and just owned with it. I managed to get 26/3/15 withh it today even without zhonyas or majais! It was so hilarious having 40% spell vamp and not dying with my ult (if u get blue buff u can leave it on and heal insane amounts!). Now granted i probably stomped some noobs and it was a practice, i still think the idea is a fun one to try at least :)
Not to mention the fact that hextech revolvers are relatively cheap, easy to build, and give good AP rather fast. Test it out yourself, tell me what you think, and GL HF!