Card Rulings:Cursed Seal of the Forbidden Spell


 * "Cursed Seal of the Forbidden Spell" only negates the activation of Spell Cards. It does not prevent the use of Continuous Spell Cards already active, like "Archfiend's Oath".

When you negate and destroy "Black Pendant" with "Cursed Seal of the Forbidden Spell", and afterwards a Set "Black Pendant" is destroyed, the effect of "Black Pendant" will not be activated (neither the "Black Pendant" that was negated nor the Set "Black Pendant" destroyed later will inflict 500 damage).
 * If you activate a Spell Card and chain "Cursed Seal of the Forbidden Spell", then your opponent cannot activate Spell Cards of the same name, even though your opponent didn't activate the Spell Card in the first place.

Unoffical

 * The name of "A Legendary Ocean" is treated as "Umi" always and for all purposes. If "Imperial Order" is active, the card name is still treated as "Umi". If the opponent activates "Cursed Seal of the Forbidden Spell" targeting "Umi", you cannot activate "Umi" or "A Legendary Ocean" for the rest of the Duel.