Mythical Destroyer Beast, Vanargandr

/:When placed, 1, choose one of your opponent's rear-guards, and retire it. If this unit is on , choose all of your opponent's rear-guards instead of one rear-guard. :At the end of the battle it attacked a vanguard, [put this unit into your soul], look at three cards from the top of your deck, put one card from among them on the top of your deck, put one card from among them on the bottom of your deck, and put the rest into your soul.