Djinn Prognosticator of Rituals

DARK
When you Ritual Summon a monster, you can banish this card from your GY as 1 of the monsters required for the Ritual Summon. If you Ritual Summon using this card, if that Ritual Summoned monster inflicts battle damage to your opponent, they discard 1 card.
400
300

Fiend DARK Effect Monster 3 effect