The rarity of Exponent of the Endless Stars is Rare, and been equipped it takes a “Bundle” slot. At this moment the item is available for trade.
Exponent of the Endless Stars is a skin for Enigma. The skin was added to the game on May 17, 2017, it was created by HyrX.
Exponent of the Endless Stars is currently one of the most popular skins, but it is rarely seen in the game due to its high price.