Chronojet Dragon

(This ability is active if you have two or more face up G units in total on your or G zone):When this unit attacks a vanguard, until end of that battle, this unit gets +5000, and your opponent cannot call grade 1 or greater units from hand to . : 1 During your turn, when your G unit , you may pay the cost. If you do, choose one of your opponent's rear-guards, and your opponent puts that unit on the bottom of his or her deck.