Arrester Messiah

(Active if you have one or more face up G units in total on your or G zone):When this unit is placed on , if you have a grade 3 or greater vanguard with "Messiah" in its card name, until end of turn, this unit gets +2000, and ":[Lock this unit] At the end of the battle that this unit attacked a vanguard, you may pay the cost. If you do, choose up to one rear-guard in any fighter's back row, and lock it.".