Diabolos, King of the Abyss [FOTB-EN061] Secret Rare Duelist Saga Once per turn: You can

Once per turn: You can discard 1 DARK monster

•3+: You can send a ""Crystal Beast"" monster you control to the Graveyard to negate the activation of a Spell or Trap Card and destroy it

You can return the monster destroyed with this effect to the top of its owner's Deck instead of sending it to the Graveyard

Set: Dark Revelation Volume 4 Card type: Effect Monster Rarity: Super Rare Attack: 1600 Defense: 1600 If this card attacks a Defense Position monster

Diabolos, King of the Abyss [FOTB-EN061] Secret Rare Duelist Saga Once per turn: You canSet: Force of the Breaker Card type: Effect Monster Rarity: Secret Rare Attack: 2800 Defense: 1000 This 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.