Sky Guardian Supreme Dragon, Bulwark Dragon

-Opponent Turn's Guard Step-[Choose a card with "[Heal] Heal" from your hand, and discard it] Call this card to your from face down. Thunderstrike 3:This unit gets +10000。 :At the end of the battle that this unit is placed on , for every four cards in your opponent's bind zone, choose up to one rear-guard in your opponent's front row, and retire it.