Chronojet Dragon

:You can perform , and cannot ride grade 3 or greater cards without "Chronojet" in their card names. :The original of your grade 3 cards with "Chronojet" in their card names become 13000. :During your turn, if you have a grade 3 or greater vanguard with "Chronojet" in its card name, all of your front row units get +5000 for each face up card in your G zone. :At the beginning of your battle phase, choose up to one of your grade 3 or greater rear-guards, and increase or decrease its grade to 0 until end of turn.