Brawler, Big Bang Knuckle Buster

:[Legion 20000]"Brawler, Big Bang Slash Buster"(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) :[ 1 & Choose a card with "Big Bang Knuckle" in its card name from your hand, and put it into your soul] If this unit is [Legion], until end of turn, this unit gets +5000 and ":When this unit would choose a unit to attack, choose four of your opponent's units instead, and this unit battles all of the chosen units in one attack.". :If you have a card named "Brawler, Big Bang Knuckle Dragon" in your soul, this unit gets +2000.