True Eradicator, Dragonic Descendant "Zillion"

-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. :[Choose a face down "True Eradicator, Dragonic Descendant "Zillion"" from your G zone, and turn it face up] If you have a heart card with "Descendant" in its card name, until end of turn, this unit gets ":[ 1 & 2 & Choose three cards from your hand, and discard them] At the end of the battle that this unit attacked a vanguard, if the attack did not hit, you may pay the cost. If you do, this unit, and it gets drive -1 until end of turn.".