Flower of Ruined Castle, Empousa

Front Row :When you 4 or more at the same time for the cost of your vanguard's ability, if your unit did not by a card's ability this turn, you may this unit. If you this unit, at the end of that turn, [retire this unit], choose a grade 2 or greater unit card from your soul, and put it into hand. (The end of turn effect can only be used if you this card by its effect)