Mask of Demonic Frenzy, Ericrius

-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. Darkness (This ability is active if cards have been put into your soul during this turn):When this unit attacks a vanguard, you may 2. If the number of cards in your soul is six or more, until end of that battle, this unit gets ":When this unit's attack hits, your opponent chooses one of his or her rear-guards, and retires it.", and if the number of cards in your soul is fifteen or more, this unit gets +1000 for each card in your soul until end of that battle.