The rarity of Occultist's Pursuit is Mythical, and been equipped it takes a “Bundle” slot. At this moment the item is available for trade.
Occultist's Pursuit is a skin for Sniper. The skin was added to the game on February 3, 2017, it was created by NotFound.
Occultist's Pursuit has been recently added to the game, which makes it rather popular with the game community.