Assault Bullet of Dust Storm, Oswald (FR)

[AUTO](RC):At the end of the battle this unit boosted a vanguard with "Eugene" in its card name, if your opponent's vanguard is grade 3 or greater and they have no rear-guards, [COST][Counter-Blast 1 & discard a card from hand], choose one of your vanguards, [Stand] it, and increase or decrease its [Critical] and drive to 1 until end of turn.