Card Rulings:Book of Moon

TCG Rulings

 * When you activate "Book of Moon" during the Battle Step to flip your defending monster into face-down Defense Position, the attack resolves as normal. No replay occurs because the possible attack targets on your side of the field did not change.


 * When you activate "Book of Moon" during the "Battle Step" to flip an attacking monster into face-down Defense Position, the attack stops. No replay is triggered. The attacking monster cannot change its battle position in "Main Phase 2", because it is still considered to have declared an attack. (So it cannot be Flip Summoned in "Main Phase 2".)


 * If you are attacking, and you chain "Book of Moon" to your opponent’s "Mirror Force" to flip one of your monsters face-down, that monster is not destroyed by "Mirror Force".


 * If you chain "Book of Moon" to "Magic Cylinder", "Ring of Destruction", or "Trap Hole" to flip the target of any of those cards face-down, the card’s effect disappears. (See "Activation & Targeting Eligibility" in the Advanced FAQ.)


 * If you use "Book of Moon" on a monster that had its ATK doubled with "Limiter Removal", the monster is not destroyed at the end of the turn.


 * If you chain "Book of Moon" to "Bottomless Trap Hole", the now face-down monster will not be destroyed by "Bottomless Trap Hole", but any other appropriate monsters Summoned at the same time will still be destroyed.


 * If you use "Book of Moon" on "Dream Clown", "Dream Clown"’s effect is not activated.


 * If you chain "Book of Moon" to the activation of a Flip Effect Monster’s effect, such as "Fiber Jar", "Book of Moon" flips the monster face-down again, but the Flip Effect still resolves as normal.


 * You cannot flip a Monster Token face-down because Monster Token are always face-up.


 * You cannot activate "Book of Moon" while "Light of Intervention" is active.

Mentions in other Rulings

 * 3-Hump Lacooda: If your opponent chains..."Book of Moon" to the activation of "3-Hump Lacooda"'s effect, the effect is not negated.


 * Adhesion Trap Hole: If a monster affected by "Adhesion Trap Hole" is flipped face-down (with "Book of Moon", etc.), "Adhesion Trap Hole"'s effect disappears and the monster's ATK is back to normal.


 * Allure Queen LV3: If "Book of Moon" is chained to the activation of "Allure Queen LV3's" effect to turn the "Allure Queen" face-down, then the monster that was targeted is destroyed. It cannot be equipped to a face-down monster.


 * Ancient Gear Castle: For "Ancient Gear Castle", "Set" means to Set from the hand. It does not include using "Book of Moon"...


 * Armor Exe: If you Summon "Armor Exe", flip it face-down with "Book of Moon", and flip it face-up with "Book of Taiyou", it CAN attack because its non-attack effect was reset and because flipping it face-up with "Book of Taiyou" was NOT a Flip Summon.


 * Big Shield Gardna: If "Big Shield Gardna" is targeted with a Spell Card, you may chain "Book of Moon" to flip it face-down, then it can negate the Spell Card and will flip back to face-up Defense Position.


 * Bottomless Trap Hole: If the opponent Summons a monster, then you activate "Bottomless Trap Hole", and the opponent chains "Book of Moon" to flip the Summoned monster face-down, it is not removed from play by the effect of "Bottomless Trap Hole".


 * Burst Stream of Destruction / Dark Magic Attack: If you activate "Burst Stream of Destruction", and the "Blue-Eyes White Dragon" is...flipped face-down with "Book of Moon"..."Burst Stream of Destruction"'s effect still resolves.


 * Chain Disappearance: If your opponent activates "Chain Disappearance" and...you chain "Book of Moon", the monster will be face-down, so no cards are removed from play for the effect of "Chain Disappearance".


 * Chaos Sorcerer: If you select a face-up monster with "Chaos Sorcerer"'s effect, and your opponent chains "Book of Moon" to flip the monster face-down, then "Chaos Sorcerer"'s effect disappears. But even if "Chaos Sorcerer"'s effect disappears, its effect was activated so it cannot attack or activate its effect again.


 * Curse of Anubis: If "Book of Moon" is chained to "Curse of Anubis" to flip a monster face-down, the effect of "Curse of Anubis" is not applied to the monster that was flipped face-down.


 * Cyber Laser Dragon: If "Book of Moon" is chained to "Cyber Laser Dragon's" effect to turn either the targeted monster or "Cyber Laser Dragon" face-down, its effect will not resolve because both monsters' ATK / DEF values can no longer be compared.


 * D.D.M. - Different Dimension Master: If the opponent chains "Book of Moon" to his effect and flips "D.D.M. - Different Dimension Master" face-down, you still resolve his effect.


 * Dark Paladin: If you activate "Dark Paladin"'s Spell-negating effect, and your opponent chains "Book of Moon" to flip "Dark Paladin" face-down, the Spell Card is still negated even though "Dark Paladin" is face-down.


 * Desert Sunlight: If you have a face-up Flip Effect monster, you can activate "Desert Sunlight", and chain "Book of Moon", another "Desert Sunlight", and another "Book of Moon". When the chain resolves, you will flip the monster down, then up, then down, then back up. The Flip Effect activates twice, and they wait to create a new chain after the current one resolves. For example, if the Flip Effect monster is "Morphing Jar", its effect will activate twice in a chain, as Chain Link 1 and Chain Link 2, they resolve in reverse order, and both players will discard and draw 5 cards, then discard and draw 5 cards again.


 * Doomcaliber Knight: Even if "Book of Moon", etc., is chained to "Doomcaliber Knight's" effect and flips the Effect Monster face-down, the Effect Monster's effect is still negated by "Doomcaliber Knight" and it is still destroyed.


 * Double Snare: You can only destroy face-up cards with the effect of "Double Snare". The opponent may chain "Book of Moon" to your "Double Snare" to flip his / her monster face-down, and it will not be destroyed.


 * Enemy Controller: If you activate either of "Enemy Controller"'s effects, and your opponent chains "Book of Moon" to flip the target monster face-down, its targeting conditions are no longer correct when "Enemy Controller" resolves and "Enemy Controller"'s effect disappears.


 * Enemy Controller: If you take control of your opponent's monster with "Enemy Controller", and then the monster is flipped face-down with "Book of Moon", control of the monster is still returned to the opponent (the original controller) during the End Phase.


 * Eria the Water Charmer / Aussa the Earth Charmer / Wynn the Wind Charmer / Hiita the Fire Charmer: If "Book of Moon" is chained to the Flip Effect of a "Charmer" to flip the target monster face-down, the effect of the "Charmer" disappears.


 * Giant Kozaky: If "Giant Kozaky" is destroyed while face-down, then its effect that inflicts damage is not activated. If "Giant Kozaky" is face-up on the field and is targeted by "Tribute to the Doomed", and you chain "Book of Moon" so that "Giant Kozaky" is face-down when destroyed by "Tribute to the Doomed", there is no damage.


 * Gorgon's Eye: If "Gorgon's Eye" is active and you activate a monster effect, and "Book of Moon" is chained to flip the monster into Defense Position, the monster's effect is still applied and is not negated by "Gorgon's Eye" because it was activated properly.


 * Grave Ohja: If "Grave Ohja" is attacked, and you activate "Book of Moon" to flip another monster on your side of the field face-down, "Grave Ohja" has already been selected as the attack target so the attack proceeds as normal.


 * Huge Revolution: When your opponent chains "Book of Moon" to your "Huge Revolution" and flips 1 of the 3 monsters face-down, "Huge Revolution" has already been activated correctly, so its effect still resolves.


 * Legacy Hunter: ...if "Legacy Hunter" attacks a face-up monster and "Book of Moon" flips it face-down, "Legacy Hunter's" effect DOES apply.


 * Levia-Dragon - Daedalus: When "Book of Moon" is chained to "Levia-Dragon - Daedalus"' effect to flip it face-down, the effect still resolves, but "Levia-Dragon - Daedalus" is destroyed by its own effect, since it's no longer "this card", it's just "a card".


 * Light of Intervention: While this card is on the field you cannot flip a monster face-down with "Book of Moon"...


 * Magical Scientist: If the Fusion Monster is flipped face-down with "Book of Moon"... the effect is reset and the Fusion Monster does not go back to the Extra Deck, and is not prohibited from attacking your opponent's Life Points directly.


 * Mist Archfiend: If this card is turned face-down by "Book of Moon", etc. Chained to its effect, it will still be destroyed and its controller will take 1000 damage.


 * Moisture Creature: If you activate the effect of "Moisture Creature" and your opponent chains "Book of Moon" to the effect, the effect still resolves and all Spell and Trap Cards on your opponent's side of the field are destroyed.


 * Montage Dragon: If "Montage Dragon" is flipped face-down by "Book of Moon", etc., when it is flipped face-up its ATK is 0.


 * Ninja Grandmaster Sasuke: If "Ninja Grandmaster Sasuke" attacks a face-up Defense Position monster, and you flip it face-down during the "Battle Step" with "Book of Moon", the monster is face-down at the start of the Damage Step so "Ninja Grandmaster Sasuke" will not destroy it with his effect.


 * Offerings to the Doomed: If your opponent chains "Book of Moon" to flip the target of this card face-down, the monster is not destroyed and you will skip your next Draw Phase.


 * Ojama Delta Hurricane!!: If your opponent chains "Ring of Destruction" or "Book of Moon" to "Ojama Delta Hurricane!!", and one of the Ojamas is destroyed or flipped face-down, "Ojama Delta Hurricane!!"'s effect still resolves.


 * Ojamuscle: This card targets 1 face-up "Ojama King". If "Book of Moon" is chained to flip the targeted "Ojama King" face-down all the other "Ojama" monsters are destroyed, but no ATK increase is given.


 * Possessed Dark Soul: You cannot gain control of face-down monsters with this card's effect, so the opponent may chain "Book of Moon" selecting a Level 3 or lower monster and they will keep control of it.


 * Raging Cloudian: The "Cloudian" monster Special Summoned with "Raging Cloudian" cannot be targeted by "Book of Moon".


 * Rampaging Rhynos: If you activate the effect of a face-up "Rampaging Rhynos", and "Book of Moon" is chained to this effect, the face-down "Rampaging Rhynos" will still move.


 * Sakuretsu Armor: If the turn player chains "Book of Moon" to "Sakuretsu Armor" to flip the attacking monster face-down, then the attacking monster is not destroyed by "Sakuretsu Armor".


 * Samsara Lotus: If "Book of Moon", etc., is chained to "Samsara Lotus'" damage inflicting effect and flips it face-down, the effect disappears.


 * Shadowslayer: If "Shadowslayer" attacks a face-up Attack Position monster, and the opponent activates "Book of Moon" so that his only monster on the field is now in Defense Position, a replay occurs, because "Shadowslayer" is now able to attack directly.


 * Shien's Spy: If you chain "Book of Moon" to "Shien's Spy" to flip the target face-down, the monster still switches to the opponent and returns in the End Phase as normal.


 * Shifting Shadows: If you control a monster that is targeted by your opponent's "Nightmare Wheel", and you flip it face-down with "Book of Moon", and control at least 1 other face-down Defense Position monster, you can activate the effect of "Shifting Shadows". However, afterwards you must tell your opponent which monster is targeted by "Nightmare Wheel".


 * Spellbinding Circle: The Battle Position of a monster targeted by this card can still be changed by card effects, such as "Book of Moon"...


 * Spirit Reaper: "Spirit Reaper" is only destroyed by its own effect if it is face-up on the field when the effect designating it as a target activates, AND after the effect designating it as a target resolves. If you Special Summon "Spirit Reaper" with Monster Reborn, or flip it face-down with "Book of Moon", or flip it face-up with "Book of Taiyou", it is not destroyed...


 * Spirit of the Pot of Greed: "Spirit of the Pot of Greed" must be face-up on the field to resolve its effect; if "Book of Moon" is chained to "Pot of Greed" or to the effect of "Spirit of the Pot of Greed", "Spirit of the Pot of Greed"'s effect is negated.


 * Star Blast: If a monster affected by "Star Blast" is face-up on the field, and is then flipped face-down (with the effect of "Book of Moon", etc.), then the effect of "Star Blast" is wiped and the monster's Level is returned to normal


 * Synchro Strike: You cannot target a Synchro Monster that was turned face-down by “Book of Moon”, etc., when it is later Flip Summoned.

OCG Rulings

 * If a Synchro Monster is flipped face-down with "Book of Moon" and then flipped face-up, it cannot be targeted by "Synchro Strike".


 * You cannot activate this card during the Damage Step.


 * Your opponent cannot activate effects that set ("flip face-down") (like "Book of Moon") while you control "Dark Simorgh". If you chain "Call of the Haunted" to "Book of Moon" and Summon "Dark Simorgh", then "Book of Moon" resolves without effect and the monster is not switched to Defense Position.


 * If the monster is flipped face-down by "Book of Moon" before "Scrap-Iron Scarecrow" can negate the attack, then "Scrap-Iron Scarecrow" is still set.


 * If "Montage Dragon" is flipped face-down by "Book of Moon" its ATK becomes 0.


 * If "Intoxicated Bug of the Ice Boundary" is flipped face-down with "Book of Moon", its effect disappears, and is not re-applied if "Intoxicated Bug of the Ice Boundary" is flipped face-up again.


 * If "Light End Dragon"/"Dark End Dragon" activates its effect, and is then flipped face-down by "Book of Moon", then the ATK/DEF decrease will disappear when "Light End Dragon"/"Dark End Dragon" is flipped face-up again.


 * If "Book of Moon" is chained to "Tragoedia"'s effect and targets the same monster, then the monster is face-down when "Tragoedia"'s effect resolves, so control of the monster does not change.


 * If "Genex Neutron" is flipped face-down, such as with "Book of Moon", and then flipped face-up during the turn in which it was Normal Summoned, then you can still activate "Genex Neutron"'s effect during the End Phase.


 * If the "Gladiator Beast" monster targeted by "Test Tiger" is not face-up on the field at resolution (for example, "Book of Moon" or "Ring of Destruction" was chained to the effect), then "Test Tiger" resolves without effect.


 * If "Ally of Justice - Blind Sucker" negates a monster's effect and then the monster is flipped face-down by "Book of Moon", then the monster's effect is no longer negated.


 * If "Book of Moon" or "Ring of Destruction" is chained to the effect of "Natural Beast" so that "Natural Beast" is not face-up on the field when its effect resolves, then the Spell Card is not negated.


 * If "Book of Moon" etc is chained to "Give and Take" so that the monster targeted by "Give and Take" is no longer face-up on the field when "Give and Take" resolves, then you still Special Summon a monster to your opponent's field.


 * If "Mosaic Manticore" is flipped face-down by "Book of Moon" and then flipped face-up before the next Standby Phase after it was Tribute Summoned, then its effect will activate as long as it is still face-up during the Standby Phase.


 * If "Book of Moon" etc flips face-down a Zombie-Type monster Special Summoned by "Doomkaiser Dragon/Assault Mode", then the effect of "Doomkaiser Dragon/Assault Mode" is no longer applied. The monster does not have its effects negated and is not destroyed during the End Phase, even if it is later flipped face-up.


 * When an "/Assault Mode" monster is Special Summoned by "Assault Revival", if it is flipped face-down by "Book of Moon" etc, the effect of "Assault Revival" is no longer applied. The monster does not have its effects negated, can be Tributed, and is not removed from play when it leaves the field.


 * If a Synchro Monster that was Special Summoned by "Descending Lost Star" is flipped face-down with "Book of Moon" etc, then the effect of "Descending Lost Star" is not applied. The monster's effects are not negated, its Level/DEF return to their original values, and it can change its Battle Position.


 * If an effect like "Book of Moon" or "Raigeki Break" is Chained to the effect of "Demonic Roaring God Galbath" so that "Demonic Roaring God Galbath" is not face-up on the field at resolution, then the effect of "Demonic Roaring God Galbath" resolves without effect and the monster is not destroyed.


 * If an effect like "Book of Moon" is Chained to the effect of "Shiba-Warrior Taro" so that "Shiba-Warrior Taro" is face-down at resolution, then the effect of "Shiba-Warrior Taro" is not applied and "Shiba-Warrior Taro" is not returned to the hand.


 * If "Majestic Mech - Senku" is flipped face-down with "Book of Moon" and then flipped face-up during the same turn, then its effect which sends it to the Graveyard will still activate during the End Phase. If "Majestic Mech - Ohka" is Normal Summoned without Tributes, or if "Majestic Mech - Goryu" is Normal Summoned with one Tribute, and either is flipped face-down with "Book of Moon" and then flipped face-up during the same turn, then its effect which sends it to the Graveyard will no longer activate during the End Phase.  If any of these monsters is face-down during the End Phase, then the monster will not be sent to the Graveyard.