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 sort of just made this up as I was playing. I figured its good to have arm + mr, and them some dmg. So I figured that I'd find a bunch of items that worked together to form some kind of solid survivability. But depending on the make up on your opposing team I'd take Randuin's Omen if they are more AD then AP. Please score and tell me stuff! My first time don't hate me.