Empyrean Blue Dragon, Shelling Cannon Dragon (D-PR)

[AUTO] [Back Row Center]:At the beginning of your battle phase, if your vanguard is "Flagship Dragon, Flagburg Dragon", and your opponent's vanguard is grade 3 or greater,[Cost] Counter-Blast 1], and until end of turn, this unit can attack from the back row, and gets +10000.
[CONT] [Back Row Center R] :If you would move or swap this unit during your main phase, you can also move it within the same row.