You can Special Summon this card (from your hand) to your center Main Monster Zone.

During your Main Phase: You can place 1 "Elfnote" Continuous Trap from your hand or Deck, face-up on your field.

During your opponent's turn (Quick Effect): You can switch the locations of this card in your Main Monster Zone and the monster in your center Main Monster Zone, then you can return 1 face-up Spell/Trap on the field to the hand.