[REQUIREMENT] During your opponent’s turn, when your opponent Normal or Special Summons a monster.
[EFFECT] Choose face-up Level 4 or higher Effect Monsters your opponent controls up to [The number of face-up Level 5 or higher LIGHT Fiend monsters you control]. During this turn, your opponent cannot activate the effects of that monster(s) and your opponent cannot Tribute those monsters for a Tribute Summon.