Hunting Gatling of Dust Storm, Firas (D-BT09/FR01EN) [Dragontree Invasion]

[AUTO]:When this unit is placed on (RC), if you have a vanguard with "Eugene" in its card name, [COST][Counter-Blast 1 & discard a card from hand], search your deck for up to one grade 3 normal order without RegalisPiece@, reveal it and put it into your hand, and shuffle your deck. [AUTO](RC)[1/turn]:When your opponent's rear-guard is retired by your card's ability during your main phase, [COST][Soul-Blast 1], [Stand] this unit, and this unit gets "Boost" until end of turn.