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.
This guide is a work in progress. I simply published it for those players who quickly look over runes/masteries/items. An extensive and detailed guide will be published in the future.
AD Marks for early damage which helps in the JG and with early ganks. Standard armor seals. 6 CD glyphs for 5% CD whichs helps early on with your Jack In The Box timers. AS Quints for better JG clear and split pushing.
With the new Season 6 changes masteries are more focused on keystones. When creating a new mastery page I recommend 1st determining which keystone you want and then simply building down the tree to that keystone. For Shaco I go Fervor of Battle for the extra stacking AA damage which also procs and helps in the jungle. The remaining 12 points are placed into cunning with MS favored over minion damage.