Giant Sea Dragon, Boatpelagic Dragon

[AUTO]:When this unit is placed on (RC) from hand, you may [Soul-Charge 1]. [AUTO](RC)[1/turn]: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 [Stand] vanguard with "Flagburg" in its card name, [COST][Counter-Blast 1 or Energy-Blast 3], [Stand] this unit, and this unit gets [Power] +10000 until end of turn.