With its Master, Red Hare

:At the end of the battle this unit boosted a vanguard with "Lü Bu" in its card name, if your has an Arms, and your damage zone has no face up cards, [put this unit into your soul & your hand has one or more cards, and discard all of the cards in your hand], choose one of your vanguards, it, and it gets drive -1 until end of turn.