The rarity of Hammer of the Grey Gallant is Uncommon. At this moment the item is available for trade.
Hammer of the Grey Gallant is a skin for Omniknight. The skin was added to the game on March 9, 2015, it was created by katzeimsack.
Hammer of the Grey Gallant is currently one of the most popular skins, but it is rarely seen in the game due to its high price.