Harmonics Messiah

:When it attacks, search your deck for up to one card, put it on as a locked card, and shuffle your deck. (Locked cards cannot do anything. They are unlocked and turned face up as at the end of their owner's turn.) :At the end of the battle it attacked, if your soul has a grade 3 or greater card, [ 1 & discard a card from your hand], choose any number of any fighters' locked cards, unlock them, draw the same number of cards, and two rear-guards in your front row get +15000 until end of turn.