Magic Ruler may refer to either of the following sets:
- Magic Ruler: A Japanese set in the Yu-Gi-Oh! Official Card Game.
- Spell Ruler: A set in the Yu-Gi-Oh! Trading Card Game in most languages and the Yu-Gi-Oh! Official Card Game in Korean and Asian-English. It was previously known as Magic Ruler.
- Magic Ruler: A set in the video game, Yu-Gi-Oh! Duel Monsters 5 Expert 1, based on the Japanese set.
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