Cannot be Normal Summoned/Set. Must be Special Summoned by sending 2 face-up Spell/Trap Cards you control to the GY. This card is unaffected by other card effects. Neither player takes battle damage from battles involving this card, except when this card is the only card you control. If this card battles, at the end of the Damage Step: Your opponent discards 1 card. If this card would be destroyed by battle, destroy it instead only if your opponent has no cards in their hand.