[AUTO](RC):[Counter-Blast 1] When your vanguard [Legion], you may pay the cost. If you do, choose one of your vanguards, until end of turn, it gets "[AUTO](VC):When this unit attacks a vanguard, your opponent chooses one of his or her rear-guards, and may retire it. If he or she does not, until end of that battle, your opponent cannot call cards from hand to (GC).".