Silver Thorn?? That is a synonym of the everlasting "greatest stage".
This card can be played from the soul, and play this with [COST][Counter-Blast 1] if you have a vanguard with "Luquier" in its card name!
Choose one of your rear-guards, and it gets"[AUTO](RC):When your vanguard attacks, [COST][put this unit into soul], choose a card with only "Pale Moon" for its clan and grade less than or equal to your vanguard from your soul, and call it to (RC)." until end of turn.