The rarity of Spines of the Lost Star is Mythical. At this moment the item is available for trade.
Spines of the Lost Star is a skin for Morphling. The skin was added to the game on August 19, 2015, it was created by daniDem.
Spines of the Lost Star is currently one of the most popular skins, but it is rarely seen in the game due to its high price.