Card Trivia:Celestial Observatory

"Celestial Observatory":

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• Appearances

• * This card has different Level-based counterparts:
  • "Sacred Sword of Seven Stars" (for Level 7 monsters)
  • "Trade-In" (for Level 8 monsters)
  • "Kuji-Kiri Curse" (for Level 9 monsters)
  • "Tokusano Shinkyojin" (for Level 10 monsters)