Crystal Skull

[ Rock / Effect ] If this card is Summoned: Take 1000 damage, then change this card to Defense Position. During the End Phase, if you did not take effect damage this turn: You can either add to your hand or Special Summon 1 Rock monster with 0 ATK from your Deck. You can only use this effect of "Crystal Skull" once per turn. ATK/ 0 DEF/ 0