Diabolos, King of the Abyss [FOTB-EN061] Secret Rare High-Speed Riders This card cannot be Special

This card cannot be Special Summoned except with "Assault Mode Activate"

This card's effects can only be applied or activated while it has Xyz Material

You can only use this effect during your opponent's Battle Phase

discard 1 "lswarm" monster

Diabolos, King of the Abyss [FOTB-EN061] Secret Rare High-Speed Riders This card cannot be SpecialSet: 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.