Glistening Nebula Knightlord, Serius

:[Return two cards with "Nebula Knight" in their card names to the deck from drop], choose up to one of your rear-guards, search your deck for up to one card with "Nebula Knight" in its card name and grade equal to that chosen unit's grade +1, call it to the that chosen unit is on, and shuffle the deck. :When this unit attacks, 1, choose a column, all of your rear-guards with "Nebula Knight" in their card names in that column, if you persona rode this turn, [discard a trigger unit from hand], look at the same number of cards from the top of your deck as the number of your rear-guards with "Nebula Knight" in their card names, and put them on the top of the deck in any order.