Lycoris Musketeer, Saul

:When this unit is placed on or , if you have a vanguard with "Musketeer" in its card name, [ 1 & retire a rear-guard], look at three cards from the top of your deck, choose up to one unit card from among them, call it to , and put the rest on the bottom of your deck in any order. If you called a trigger unit, 1, and activate all of that card's trigger effects. (Perform this trigger effect before other cards' abilities)