2 "Dream Mirror" monsters with different Attributes While face-up on the field, this card is also LIGHT-Attribute. You can only use each of the following effects of "Oneiros, the Dream Mirror Tormentor" once per turn. ● When a monster effect is activated while "Dream Mirror of Terror" is in a Field Zone (Quick Effect): You can negate that effect. ● If "Dream Mirror of Joy" is in a Field Zone (Quick Effect): You can Tribute this card; Special Summon 1 "Oneiros, the Dream Mirror Erlking" from your Extra Deck in Defense Position.