The skin was added to the game on May 17, 2020. It was created by VALVE.
The rarity of Heinous Exultation - Arms is Mythical, and been equipped it takes a “arms” slot. The skin doesn’t have alternative styles. At this moment the item is available for trade.
At the moment, Heinous Exultation - Arms is not on the list of popular skins and is rarely seen in the game.