Oneiros, the Dream Mirror Erlking

2 "Dream Mirror" monsters with different Attributes <br>While face-up on the field, this card is also DARK-Attribute. You can only use each of the following effects of "Oneiros, the Dream Mirror Erlking" once per turn. <br>• If another monster you control is Tributed (except during the Damage Step): You can target 1 card on the field; destroy it. <br>• If this card in its owner's possession is destroyed by an opponent's card: You can Special Summon 1 "Dream Mirror" monster from your GY, except "Oneiros, the Dream Mirror Erlking".