"Claret Sword Dragon" (クラレットソード・ドラゴン Kuraretto Sōdo Doragon) is a series of cards with "Claret Sword Dragon" in its card name exclusive to the Shadow Paladin clan. The first card was introduced in G Booster Set 3: Sovereign Star Dragon, and it received further support in G Booster Set 4: Soul Strike Against The Supreme and G Booster Set 6: Transcension of Blade and Blossom.
Claret Sword Dragon is...
A knight of the black knights "Shadow Paladin" that lives in the darkness of the holy nation. It is called by the name of "Claret Sword" due to its sword that is stained as red as blood. It holds the belief that "might makes right," and although it belongs to the knights that "support the holy nation from the shadows", it disagrees with that idea.
Like most of Shadow Paladin, Claret Sword Dragon focuses on retiring your own rearguards for powerful effects. They have an added focus of Superior calling Grade 1 or lower cards, while Claret Sword Dragon's Stride forms reveal the top two cards of the deck and gain advantages if you get Grade 1 or lower cards with those effects. They also have a few effects that activate when cards are retired for the cost of their effects and have multiple ways to Countercharge.
List of "Claret Sword Dragon" Cards
List of Support Cards