Amorphage Gluttony

[ Pendulum Effect ] 
While you control an "Amorphage" monster, monsters cannot activate their effects, except "Amorphage" monsters. Once per turn, during your Standby Phase, Tribute 1 monster or destroy this card.

[ Monster Effect ] 
If this card is Pendulum Summoned or flipped face-up, neither player can Special Summon monsters from the Extra Deck while this card is face-up on the field, except "Amorphage" monsters.