Edison format ruling
Shadow-Imprisoning Mirror
Card text as printed in this era① If the effect of a DARK monster is activated on the field/GY, negate that effect.
Rulings
- This doesn't stop monster effects from activating. It just negates any effect which does activate (on the field/GY).
- Even if the Physical card is no longer on the field/GY, the effect is still negated.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Edison forum — sourced change requests get reviewed.