Brawler, Big Bang Knuckle Dragon

:[Legion 20000]"Brawler, Big Bang Slash Dragon"(If your opponent's vanguard is grade 3 or greater, this unit may return four cards from your drop zone into your deck once, search your deck for the specified card, and Legion) : 2-card with "Brawler" in its card name] If this unit is [Legion], until end of turn, this unit gets +5000 and ":This unit battles all of your opponent's units in the front row in one attack.". : 1 When this unit attacks a vanguard, you may pay the cost. If you do, this unit gets +3000 until end of that battle.