Revenger, Raging Fall Dragon "Яeverse"

:[Lock a rear-guard with "Revenger" in its card name], choose three of your units with "Revenger" in their card names, and they get +5000 until end of turn. :This ability's cost is reduced by 1 for each of your locked cards. At the end of the battle this unit attacked, [ 3 & discard three cards from hand], choose up to two of your rear-guards, and lock them. Then, if you have two or more locked cards or five cards in your damage zone, this unit.