Fiend-Type monsters you control, except "Fiendish Rhino Warrior", cannot be destroyed by battle or card effects. If this card is sent to the Graveyard: You can send 1 Fiend-Type monster from your Deck to the Graveyard, except "Fiendish Rhino Warrior". You can only use this effect of "Fiendish Rhino Warrior" once per turn.
