Gishki Zielgigas (HA07-EN057) - Hidden Arsenal 7: Knight of Stars Unlimited

You can Ritual Summon this card with any "Gishki" Ritual Spell Card. Once per turn: You can pay 1000 Life Points; draw 1 card and reveal it, then, if it was a "Gishki" monster, shuffle 1 card from the field into the Deck.