The rarity of Twisted Maelstrom is Mythical, and been equipped it takes a “Bundle” slot. At this moment the item is available for trade.
Twisted Maelstrom is a skin for Enigma. The skin was added to the game on July 19, 2018, it was created by Hawf.
Twisted Maelstrom is currently one of the most popular skins, but it is rarely seen in the game due to its high price.