Nebula Dragon, Big Crunch Dragon

(Released when both players' vanguards are grade 3 or greater!)-Stride Step-[Choose one or more cards with the sum of their grades being 3 or greater from your hand, and discard them] this card on your from face down. :[ 1 & Choose a face down card named "Nebula Dragon, Big Crunch Dragon" from your G zone, and turn it face up] If the number of face up cards in your G zone is two or more, choose one of your opponent's rear-guards, lock all of your opponent's rear-guards in the same column as that unit, and those cards cannot be unlocked during your opponent's next end phase. (The locked card is turned face down, and cannot do anything. It turns face up at end of the owner's turn.)