Diabolos, King of the Abyss (FOTB-EN061) - Force of the Breaker Unlimited Number_DL13-EN019 but they cannot activate their

but they cannot activate their Pendulum Effects this turn

that monster's current ATK is halved

destroy all monsters you control (except for Destiny Hero monsters)

Card TextThis card gains 300 ATK for every "Dark Magician" or "Magician of Black Chaos" in any Graveyard

with each pack containing 9 random cards

Diabolos, King of the Abyss (FOTB-EN061) - Force of the Breaker Unlimited Number_DL13-EN019 but they cannot activate theirTypeDragon Effect Monster AttributeDARK Level Rank7 ATK DEF2800 1000 Card TextThis card cannot be Special Summoned. If you Tribute Summon this card, the Tributes must be DARK. This card cannot be Tributed by a card's effect. During your opponent's Draw Phase, before their draw, look at the top card of their Deck, then put that card on the top or the bottom of their Deck.