Battle Sister, Pannacotta

/:[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 +5000, and "/: 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.".