Giant Sea Dragon, Boatpelagic Dragon

:When this unit is placed on from hand, you may 1. :At the end of the battle this unit attacked a vanguard, if it was the first or second battle this turn, and you have a grade 3 or greater vanguard with "Flagburg" in its card name, [ 1 or 3], this unit, and this unit gets +10000 until end of turn.