Advanced format ruling
Seal of Wickedness
Card effect (current official text)Once per turn, during your opponent's Standby Phase, select 1 face-up card on the field. The selected card's effect(s) is negated during that turn. During each of your Standby Phases, pay 500 Life Points or destroy this card.
Current rulings for this card are maintained by Konami.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Advanced forum — sourced change requests get reviewed.