Djinn Prognosticator of Rituals (SS04-ENB15) [Speed Duel Decks: Match of the Millennium]

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