I made a lot of mistakes on this one.
Berserker Soul: Activate by discarding your entire hand, then select one monster you control with 1500 or less attack points; draw cards from the top of your deck, the selected monster may keep attacking until you have drawn a non-monster card.
Context of the duel: Yami Yugi's partner, little Yugi, has lost his soul to Doma and Weevil(Haga) has knowledge of his whereabouts. Then Weevil(Haga) tells Yami Yugi that Yugi's soul is trapped within a card he is holding. Yami Yugi begs Weevil(Haga) to give him the card, but Weevil(Haga) rips it in half. Yami Yugi witnesses this and goes into a state of shock, but then Weevil(Haga) reveals that he was kidding and it was just a common card. Infuriated by Weevil's(Haga) behavior, Yami Yugi attacks Weevil(Haga) and wins the duel then continues to attack Weevil(Haga) 5 more times until Tea(Anzu) stops him.