The rarity of Splendor of the Protean Emperor is Mythical, and been equipped it takes a “Bundle” slot. At this moment the item is available for trade.
Splendor of the Protean Emperor is a skin for Morphling. The skin was added to the game on January 8, 2016, it was created by Yestar.
Splendor of the Protean Emperor is currently one of the most popular skins, but it is rarely seen in the game due to its high price.