Barking Dragon Tamer

:[ 1 & 1 & Choose a card from your hand, and discard it] When this unit is placed on , you may pay the cost. If you do, retire all of your rear-guards, your opponent chooses the same number of his or her rear-guards as the number of your rear-guards retired with this effect, and retires them. Until end of turn, this unit gets +1000 for each unit retired with this effect, and you cannot normal call.