Dark Knight, Efnysien

(Released when both players' vanguards are grade 3 or greater!)-Stride Step-[Choose one or more cards with the sum of their grades being 3 or greater from your hand, and discard them] this card on your from face down. :[Choose one of your rear-guards, and retire it] When this unit is placed on , you may pay the cost. If you do, until end of turn, this unit gets +7000, and ":When this unit's attack hits a vanguard, choose one of your opponent's rear-guards, and retire it.".