People will say
for initial dmg
more crit dmg for both AD and AP.
maybe some heals?
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.
The idea of ap crit.
statikk shiv will deals "bonus 100 ap dmg with crits" this means if you have other item that gives basic attack ap dmg, that will crit too. (I think.) I tried Q on minions and and deals about 300 ad (without crit) + over 900 ap dmg. (maybe not) on champion with some mr, deals some ad + over 500 ap dmg.