If this card is Special Summoned by the effect of a “Dream Mirror” monster: You can target 1 card on the field; destroy it. During the Main or Battle Phase, if “Dream Mirror of Joy” is in a Field Zone (Quick Effect): You can Tribute this card; Special Summon 1 “Morpheus, the Dream Mirror White Knight” from your Deck. You can only use each effect of “Morpheus, the Dream Mirror Black Knight” once per turn.
