Cannot be Normal Summoned/Set. Must be Special Summoned by its own effect. You can only use the (1) effect of this card's name once per turn.
(1) (Quick Effect): You can discard 1 Quick-Play or Ritual Spell; Special Summon this card from your hand in Defense Position.
(2) If this card is Special Summoned: You can Set 1 Spell/Trap that mentions "Light and Darkness Ritual" from your Deck or GY.
(3) At the start of the Battle Phase: You can make your opponent lose 800 LP, and if you do, this card gains 800 ATK.