Djinn Prognosticator of Rituals (THSF-EN039) - The Secret Forces Unlimited

When you Ritual Summon a Ritual Monster, you can remove from play this card from your Graveyard as 1 of the monsters required for the Ritual Summon. When the monster Ritual Summoned using this card inflicts Battle Damage to your opponent, your opponent must select and discard 1 card.