Shien

Shien, known as Purple Flame in the OCG, is a series of cards related to the "Six Samurai" and "Legendary Six Samurai", through "Gateway of the Six". The Japanese effect text for "Gateway of the Six" specifies all cards in the "Shien" series must have 「紫炎」 in their Japanese names, with 「シエン」 as furigana. For this reason, "Kagemusha of the Blue Flame" is a "Shien" card, while "Shien's Spy" and "Legendary Six Samurai - Shien" are not "Shien" cards and thus do not work with "Gateway".