Stormband Dragon

:When this unit is placed on , if you have a grade 3 or greater vanguard with "Eugene" or "Gandeeva" in its card name, 3, choose one of your opponent's rear-guards, and retire it. If you did not retire a card, draw a card, and this unit gets +5000 until end of turn. :At the beginning of your battle phase, if your opponent's rear-guard was retired this turn, this unit.