Nullity Revenger, Masquerade

/:When placed, look at seven cards from the top of your deck, reveal up to one "Illusionary Revenger, Mordred Phantom" or "Blaster Dark" from among them and put it into your hand, and shuffle your deck. If you put a card into your hand, retire one of your rear-guards. /:During the battle it attacked a vanguard, this unit gets +3000.