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.
Basically i start with the sword to give damage and I quickly turn it into a brutalizer. With the cd reduction, armor pen and damage it's amazing early game. I then get my berserker greaves for atk speed increase. Sheen then increases damage when skills are used, such as deceive. Phantom dancer increases atk speed, crit and movement speed and infinity edges 200% damage increase makes sheen better.
By late game you do around 1500 damage per crit and you'll crit 3/4's of the time.
Item Build Recap:
Long Sword and HP Pot-> Brutalizer -> Berserker Greaves -> mana crystal -> zeal -> sheen -> Phantom Dancer -> Avarice Blade -> Infinity Edge (B.F. Sword first) -> Ghostblade
You should have 1 spot left after all this. Most times you won't get farther than the build above but if you do Madreds, Black Cleaver, or Bloodthirster does well depending on the situation.