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.
first i start up with buying boots of swiftness. then i go for the sword of the devine because of the epic extra damage. then i go for bloodthirster so i can get some lifesteal. then phantom dancer so i can move even quicker and shoot some faster. then 1 more bloodthirster for more dmg and lifesteal. then i finnish off with an infinity edge do get some epic crit dmg