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— The tagline of Structure Deck R: Lord of Magician in promotional material
"Endymion, the Master Magician" appears as a character in Yu-Gi-Oh! 5D's World Championship 2009: Stardust Accelerator and has a Duel School related to it in Yu-Gi-Oh! ARC-V, and "Crusader of Endymion" appears in Yu-Gi-Oh! 5D's World Championship 2010: Reverse of Arcadia".
They're named after Endymion from Greek mythology.