[AUTO]:When this unit is placed by riding from a unit with "Revenger" in its card name, [COST][Counter-Blast 1 & discard a card from hand], search your deck for up to one "Revenger, Raging Form Dragon", ride it as [Stand], and shuffle the deck. If you rode a card, choose a "Revenger, Slay Hex Dragon" from your soul, and put it into hand.