Dracossuaire Subterreur Béhémoth RATE-FR083

FLIP: You can activate this effect this turn, all "Subterror" cards you control cannot be destroyed by your opponent's card effects. You can only use this effect of "Subterror Behemoth Burrowing" once per turn. When a face-up monster you control is flipped face-down, if you control no face-up monsters: you can Special Summon this card from your hand in face-up Defense Position. Once per turn: you can change this card to face-down Defense Position.