Card Trivia:Thestalos the Firestorm Monarch
- This monster appears in the artworks of "Domain of the True Monarchs", "March of the Monarchs", "The Monarchs Erupt", and "Tribute Carnival".
- This monster has an upgraded form: "Thestalos the Mega Monarch".
- This monster has a "Vassal" counterpart: "Berlineth the Firestorm Vassal".
- The names of both monsters are derived from the names of cars produced by Ferrari. Specifically, this monster's name is derived from the Ferrari Testarossa, a series of sports cars that was preceded by the Ferrari Berlinetta Boxer.
