Mask of Demonic Frenzy, Ericrius (G-BT07/038EN) [Glorious Bravery of Radiant Sword]

[Stride]- Stride Step -[Choose one or more cards with the sum of their grades being 3 or greater from your hand, and discard them] Stride this card on your (VC) from face down. [AUTO](VC) Darkness (This ability is active if cards have been put into your soul during this turn) :When this unit attacks a vanguard, you may Soul Charge (2). If the number of cards in your soul is six or more, until end of turn, this unit gets"[AUTO](VC):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 [Power]+1000 for each card in your soul until end of that battle.