Stealth Dragon, Dual Weapon

Shadowstitch-:[Retire this unit] At the end of the battle that this unit attacked a vanguard, if that attack did not hit, you may pay the cost. If you do, choose one of your grade 1 or 3 rear-guards, search your deck for up to one card with the same card name as that unit, call it to , shuffle your deck, and at the end of that turn, put the unit called with this effect on the bottom of your deck.