- The name "Gren" is a color pun, meaning "green". It could also refer to the color borders of Spell Cards, which this card can destroy.
- This card's Chinese name, 綠古林, is a combination of 綠 ("green") and 古林 gǔlín (transcription of its Japanese name グリン Gurin).
- "Dark World Grimoire" seems to be depicted in this card, but note this book has no "legs" which "Dark World Grimoire" has.
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