Sharp Bullet of Dust Storm, Thruston

:When this unit is placed on from deck by the ability of your vanguard, 3, choose one of your opponent's rear-guards, and bind it. :At the beginning of your battle phase, if your opponent's rear-guard was retired by the ability of your grade 3 or greater vanguard with "Eugene" in its card name this turn, 1, choose one of your rear-guards, that unit and this unit, and they get +5000 until end of turn.