Stunning Wave Dragon

[AUTO]:When this unit is placed on (RC) from deck or hand, if you have a vanguard with "Argo Siren" in its card name, this unit gets [Power] +5000 until end of turn, [COST][Counter-Blast 1 or Energy-Blast 3], and draw a card. [AUTO](RC)[1/turn]:When this unit attacks, you may have this unit get [Power] +5000 until end of turn. If you do, at the end of that turn, retire this unit.