Evigishki Tetrogre (HA06-EN018) [Hidden Arsenal 6: Omega Xyz]

You can Ritual Summon this card with any "Gishki" Ritual Spell Card. Once per turn: You can declare a card type (Spell, Trap, or Monster); your opponent can discard 1 card to negate this card's effect, otherwise both players send 1 card of the declared type from their Main Deck to the Graveyard.