Demonic Swordsman of Riving, Eligos

[AUTO](RC):When this unit attacks a vanguard, if you have a vanguard with "Favrneel" in its card name, [COST][put one other rear-guard into soul], choose one of your opponent's rear-guards, retire it, and if the sum of the grades of 《Dark States》 cards in your soul is thirteen or greater, [Counter-Charge 1].