Edison format ruling
Dimension Wall

Card text as printed in this era① If your opponent's monster declares an attack:
During this attack's Damage Calculation, your opponent takes any Battle Damage you would have taken.
Rulings
- This card can only be activated in response to an Attack Declaration.
- The effect is applied during Damage Calculation.
- The damage is Battle Damage, not Effect Damage.
- If "Waboku" has already been activated this turn, you can't activate this card. However, if "Waboku" is activated in response to an attack, you can chain this card.
- If "Unifrog" attacks, and this card is activated, "Unifrog"'s effect will not activate.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Edison forum — sourced change requests get reviewed.