Arcanists aren't really something new in League of Legends, as we met Master Arcanist Ziggs in 2015. However, the family wasn't really founded, as he was the only one to possess such appearance.
With Patch 10.14, things are going to change, as the Arcanist skin line is expanding to include Kog'Maw, Shaco, and Zoe!
Arcanist Kog'Maw — 1350 RP
In-game Preview
Chromas
Arcanist Shaco — 1350 RP
In-game Preview
Chromas
Arcanist Zoe — 1350 RP
In-game Preview
Arcanist Zoe Prestige Edition — 100 pts
In-game Preview
Currently being tested on the PBE as a new content of the 10.14 patch cycle, these three skins should hit live in two weeks, on July 8.