[AUTO](VC/RC):[Choose a card with "Battle Sister" in its card name from your hand, and discard it] When this unit attacks a vanguard, you may pay the cost. If you do, until end of that battle, this unit gets [Power] +5000, and "[AUTO](VC/RC):[Counter-Blast 1] When this unit's attack hits, you may pay the cost. If you do, draw two cards, choose a card from your hand, and discard it.".