Ceruli, Guru of Dark World (SDGU-EN003)

If this card is discarded to the Graveyard by a card effect: Special Summon this card from the Graveyard to your opponent's side of the field in face-up Defense Position. When this card is Special Summoned by the effect of a "Dark World" card: Your opponent must discard 1 card.

Fiend / Effect, Gates of the Underworld Structure Deck