Ceruli, Guru of Dark World

Level 1 DARK/Fiend Effect
100 ATK / 300 DEF

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.

Rulings – Yugipedia

Printings:

Gates of the Underworld Structure Deck: SDGU-EN003 (Super Rare) - 2011-10-13
Structure Deck: Dark World: SR13-EN015 (Common) - 2022-12-01

Prices:

Cardmarket: 0.14 €
TCGplayer: $ 0.15