Bolt Blamer Dragon

:When this unit attacks a vanguard, if you have a vanguard with "Scarlet Flame" in its card name, this unit gets +5000 until end of that battle. At the end of that battle, [ 1 & retire this unit], choose one of your opponent's rear-guards, and retire it. If it was not retired, draw a card, choose a card from your drop, and bind it face down.