If this card attacks or is attacked, your opponent cannot activate cards or effects until the end of the Damage Step. If this card is destroyed by battle and sent to the Graveyard, or if this card in your possession is destroyed by an opponent's card (either by battle or by card effect) and sent to your Graveyard: You can Special Summon this card from the Graveyard, and if you do, it gains 800 ATK. You can only use this effect of 'Frightfur Sheep' once per turn.