Mirror Wall

 This card has the highest LP maintenance cost in the game.

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This card appears in the artwork of the anime version of Trap Jammer.

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This card did not have a maintenance cost when it appeared in the manga, and later the anime. The maintenance cost was added when the card was printed in the TCG, presumably to balance the card.

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TCG Rulings

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Imperial Custom: If you do not pay the maintenance cost for “Mirror Wall” or “Imperial Order” while “Imperial Custom” is face-up on the field, those cards will still be destroyed.

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OCG Rulings

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The text "During each of your Standby Phases, pay 2000 LP or destroy this card." is not a card effect. Paying Life Points during the Standby Phase is a maintenance cost to keep this card on the field. (This does not use a Chain Link.): Mirror Wall

The effect "Each of your opponent's monsters that conducted an attack while this card was face-up on the field has its ATK halved" does not use a Chain Link.

If a monster whose ATK is already halved by the effect of "Mirror Wall" attacks, after the attack that monster's ATK remains halved.

This card can be activated during the Damage Step, from the start of the Damage Step to before damage calculation.

"Summoned Skull" (2500 ATK) is equipped with "Axe of Despair" (increasing its ATK by 1000, giving it 3500 ATK total). If it attacks while the opponent controls "Mirror Wall", its ATK becomes 1750 (half of 3500). After that, if "Mystical Space Typhoon: "Summoned Skull" (2500 ATK) is equipped with "Axe of Despair" (increasing its ATK by 1000), and it attacks while the opponent controls "Mirror Wall". After that, "Mystical Space Typhoon" is activated, destroying "Axe of Despair". What happens to its ATK?

While your opponent controls "Mirror Wall", if your monster equipped with "Megamorph" attacks, the ATK of the monster while equipped with "Megamorph" will be halved. If your LP are higher than your opponent's, the monster's ATK will be halved by "Megamorph", then halved again by "Mirror Wall". If your LP are lower than your opponent's, the monster's ATK will be doubled by "Megamorph", then that doubled ATK will be halved by "Mirror Wall".: While your opponent controls "Mirror Wall", if your monster equipped with "Megamorph" attacks, what happens to its ATK?

If a monster whose ATK is already halved by the effect of "Mirror Wall" attacks, its ATK will not be halved again (it will not become 1/4 of its ATK). However, if a monster if being affected by two copies of "Mirror Wall" at the same time, its ATK will be halved twice to become 1/4 of its ATK.: If a monster whose ATK is already halved by the effect of "Mirror Wall" attacks, will its ATK be halved again?

Previously Official Rulings

If "Mirror Wall" is already face-up on the field when a monster declares an attack, "Mirror Wall" reduces the ATK of the attacking monster by half when the attack is declared.

If "Mirror Wall" is activated during an attack (including during the Damage Step), then it reduces the ATK of the attacking monster when "Mirror Wall" resolves. (Even though "Mirror Wall" normally reduces the attack by half when the attack is declared, it will still reduce the attack by half if you activate it after the attack is declared.)

If "Mirror Wall" halves the ATK of a monster, it remains halved as long as "Mirror Wall" remains face-up on the field. If "Mirror Wall" is removed from the field, the ATK of the monsters is restored.

If a monster attacks twice (over 2 turns, or if “Black Luster Soldier - Envoy of the Beginning” attacks twice in a row, etc.), its ATK is still only reduced by half once. So “Black Luster Soldier - Envoy of the Beginning” will have 1500 ATK for both of its attacks, for example.

If you have 2 copies of "Mirror Wall", and a monster attacks, its ATK is one-quarter. So “Blue-Eyes White Dragon” would have 750 ATK, for example. If 1 of the "Mirror Wall" copies leaves play, then the ATK is increased to half (if both copies leave play, the ATK is restored to full.)

You can activate "Mirror Wall" during the Damage Step before damage calculation.

The effect of "Mirror Wall" does not target.

"Reverse Trap" will have no effect on "Mirror Wall".

Mentions in Other Rulings

Amplifier"Jinzo with Amplifier", your Trap Cards are not negated and their effects are applied, including "Mirror Wall"

Injection Fairy Lily: The effect of "Mirror Wall" will reduce "Injection Fairy Lily"s ATK by half before you decide to use its effect or not. So if you activate its effect, its ATK will be 3200. If 2 copies of "Mirror Wall" are active, its ATK will be 3100.

Shrink: If a monster affected by "Shrink" attacks while "Mirror Wall" is in play, both effects are applied and the monster's ATK becomes 1/4 its original ATK. Because "Mirror Wall" continually recalculates, the result is the same no matter which card is activated first.

The Hunter with 7 Weapons: When you declare an attack with this card against a monster of the selected Type, and the opponent activates "Mirror Wall", the ATK will be halved first at attack declaration, and then increased by 1000 during damage calculation. So the final ATK will be 1500 = (1000/2) + 1000.

Waboku: SCENARIO 4:
Player A's "Mega Thunderball" attacks Player B's "Mega Thunderball". Player B activates "Fairy Box" or "Mirror Wall". Player A activates "Waboku". RESULT: Player A's "Mega Thunderball" (with reduced ATK) is not destroyed, nor does Player A lose any life points, because of Player A's "Waboku". But because Player A's "Mega Thunderball" had reduced ATK, Player B's "Mega Thunderball" is not destroyed either.