Drill Monk of the Fierce Foot

:[Choose one of your other rear-guards, and lock it] When this unit is placed on or , you may pay the cost. If you do, your opponent chooses one of his or her rear-guards, locks it, you choose one of your rear-guards in the same column as that locked card, and lock it. :When this unit attacks a vanguard, you may choose one of your locked cards. If you do, this unit gets +2000 until end of turn, and that locked card cannot be unlocked during your next end phase.