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After drawing circles for Game Freak, Nintendo, and former producer Creatures, Masuda explained

Power Nullifier: One of three effects that Number 46: Dragulon's detach effect allows the controller to apply is to prevent the opponent's Dragon-Type monsters from activating their effects until the end of the opponent's turn (the next turn after said detach effect is activated)

But maybe you'll do better

Even a limitation on the power of a searcher like Nue to only allow Majespecter or Dracoslayer monsters to be Special Summoned for the remainder of the turn is of little concern when the deck is able to successfully load its Pendulum Zones and flood the field for access to its wide array of archetype Extra Deck monsters far easier than ever before