Dream Mirror Phantasms

When this card is activated: You can add 1 "Dream Mirror" monster from your Deck to your hand. If "Dream Mirror of Joy" is in a Field Zone, all monsters you control gain 500 ATK/DEF. If "Dream Mirror of Terror" is in a Field Zone, all monsters your opponent controls lose 500 ATK/DEF. You can only activate 1 "Dream Mirror Phantasms" per turn.