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.
Alright I will be honest here I have no had to many attempts to use this simply because I end up with decent team balance often and if I am playing GP in a decent team we do not lack magic damage. However on the chance that your are playing GP and your team lacks magic damage this works wonderfully. It does need some refinement but its proven me well the few chances I have had at it for fun. This mostly works out for two separate reasons the first being parley. It gives so much gold now with decent MP regen and the rune setup with constant use of raise morale to deny exp/give you damage you can still DPS while you get the ToG built. As far as physical damage I manage to hit 1k parley crits simply once I get infinity edge alone often. So it honestly doesn't take much to turn your self into a well rounded DPS. I level remove scurvy the least despite the 1:1 ratio simply because if you do it early the enemy will build to counter the high healing which is why AP plank alone is not so easy.