Ascetic Dracokid

:Forerunner Thunderstrike 1 (Active when your opponent's bind zone has one or more cards):When this unit boosts ([Boost]), this unit gets +2000 until end of that battle. :[Retire this unit] When any players' rear-guard other than this unit is retired from due to card effects during your turn, you may pay the cost. If you do, your opponent chooses one of his or her rear-guards, retires it, and binds it face up.