REDU format ruling
Mirror Wall
Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)Each of your opponent's monsters that conducted an attack while this card was face-up on the field has its ATK halved as long as this card remains on the field. During each of your Standby Phases, pay 2000 LP or destroy this card.
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.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.