Enneacraft - Archa.TAIL

You can reveal this card in your hand; Special Summon 1 monster from your hand in face-down Defense Position. You cannot Special Summon the turn you activate this effect, except in face-down Defense Position. When your opponent activates a card or effect that would destroy a cards(s) on the field (Quick Effect): You can change this Set card to face-up Defense Position; monsters and "Enneacraft" Spells you control cannot be destroyed by card effects for the rest of this turn. Each time a monster(s) is sent to your opponent's GY while you control this monster flipped face-up, inflict 900 damage to them.