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 start out with a Doran's ring and one Health Pot. It's best to take mid since you don't have to worry about someone getting the last hits + your range is just amazing you can harass the hell out of the other guy. Next in the list would be a Boots of Speed and Mejai Soul Stealer. After I get some kills I'll finish my Sorcerer's Shoes and start stacking my Arch Angel's. After I get two Arch's I'll start building my Deathfire Grasps with a Kage's Lucky Pick, and you're cooldowns are now between 25 and 30 seconds for the Ult !!
After that I'll get my Zhonya and you now have the greatest AP of the game.
But of course, if you want to have the 28seconds of cooldown for the Light, your Mejai's Soulstealer will need to be x20 !
So, bye bye, light'em up during all the game !