If this card is in your hand or Graveyard: You can target 1 "Cipher" Xyz Monster you control; attach this card to it as an Xyz Material. If this card is sent to the Graveyard: You can add 1 "Cipher" Spell/Trap Card from your Deck to your hand. You can only use 1 "Cipher Etranger" effect per turn, and only once that turn.