Genesis Dragon, Bearing Messiah

(G units cannot be in your main deck. You can stride when both fighters' vanguards are grade 3 or greater, it gains the power and card name of one heart, and at the end of the turn, return it face up) -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 When this unit attacks a vanguard, you may pay the cost. If you do, choose a rear-guard in any fighter's back row, lock it, choose a locked card, and unlock it. (The locked card is turned face down, and cannot do anything. It is unlocked and turns face up at end of the owner's turn)