2 Dragon monstersOnce per opponent's turn, if this card is in the Extra Monster Zone (Quick Effect): You can Tribute 1 monster from your hand or field; return 1 face-up card on the field to the hand. If this card is Tributed: Special Summon 1 Dragon monster from your hand or Deck, and make its ATK/DEF 0. You can only use this effect of "Hieratic Seal of the Heavenly Spheres" once per turn.