Mysterious Puppeteer

 In Yu-Gi-Oh! The Duelists of the Roses if this card is your Deck Master the Ritual Monster Psycho-Puppet will gain 1500 ATK giving it a total of 3500 ATK.

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The first Spanish edition of this card used the word oponente instead of adversario (the official term for opponent). This was corrected in newer prints. Still, both kept the word campo (field) without a capital letter.

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OCG Rulings

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Even if a monster is Normal Summoned or Flip Summoned to the opponent's side of the field, your Life Points are increased.: Mysterious Puppeteer

This effect is applied when Normal Summoning or Flip Summoning. It is not applied when Special Summon

Previously Official Rulings

When you have "Mysterious Puppeteer" face-up on the field, if you Summon a monster and you opponent activates "Trap Hole" your monster is destroyed and you still gain 500 Life Points, since the monster was Summoned and then destroyed.

Ceasefire: Monsters flipped by "Ceasefire" are not Flip Summoned, so the effect of "Mysterious Puppeteer" does not activate.

Dark Lucius LV6: If "Dark Lucius LV6" destroys a monster with a Trigger Effect that wouldn't activate, like "Mysterious Puppeteer", then "Dark Lucius LV6" did not negate its effect. So you cannot Special Summon "Dark Lucius LV8".

Fire Princess: If "Mysterious Puppeteer" is on the field when you Summon "Fire Princess", "Fire Princess's" effect will deal 500 damage to your opponent because of "Mysterious Puppeteer's" effect.

Gemini monster: When you have a Gemini monster already face-up on the field, you may use your Normal Summon to turn on the effect of the Gemini monster, making it an Effect Monster on the field. This is treated the same as any other Normal Summon, so cards that may be activated in response to a Normal Summon may be activated now, such as the effect of “Mysterious Puppeteer”.

King Tiger Wanghu: If "King Tiger Wanghu" is on the field along with Trigger Effect monsters such as "Mysterious Puppeteer", "Ryu-Kishin Clown", "Sonic Bird", and "Dragon Seeker", then they form a chain.

Light of Intervention: While this card is on the field, monsters can be Normal Summoned in face-up Defense Position, and will trigger effects like the effect of "Mysterious Puppeteer".