Stealth Rogue of Night Fog, Miyabi

: 1 When this unit attacks a vanguard, if this unit is boosted ([Boost]), you may pay the cost. If you do, this unit gets +3000 until end of that battle. Then, if the number of cards in your hand is less than your opponent's, choose a card at random from your opponent's hand, bind it face down, and at the end of that turn, your opponent puts the card bound with this effect into his or her hand.