Dark Yugi and Seto Kaiba ' s school Duel Dark Yugi and Seto Kaiba ' s school Duel was a Shadow Game of " Duel Monsters " in the " Yu - Gi - Oh ! " manga . This was Dark Yugi and Seto Kaiba ' s first Duel . Events . Prior . Seto Kaiba got his eyes set on Sugoroku Mutou ' s " Blue - Eyes White Dragon " card after seeing it in Kame Game . Following an unsuccessful attempt to buy or trade for it , he made a counterfeit , which he tried switching with Sugoroku ' s when Yugi Mutou brought it to school . Yugi approached Kaiba afterwards , saying he knew he took the card , but didn ' t want to say it front of everyone else and asked for it back . Kaiba denied taking it at first , but when Yugi persisted , he struck him with his briefcase . However Yugi switched to Dark Yugi and challenged Kaiba to a game of " Duel Monsters " . Dark Yugi and Kaiba prepared to Duel in a classroom . Planning on making it a Shadow Game , Dark Yugi warned Kaiba that the rules of this game would be a bit different than what Kaiba is used to . Kaiba thought his Deck would be strong enough to win regardless of whatever house rules , but could still use the " Blue - Eyes White Dragon " and pretend to have gotten it elsewhere , should he get stuck . The Duel . Kaiba ' s turn Kaiba Summoned " Ryu - Kishin " and was surprised to see the monster come to life . Dark Yugi ' s turn Dark Yugi Summoned " Blackland Fire Dragon " and used it to attack and destroy " Ryu - Kishin " ( Kaiba : 2000 → 1500 Life Points ) . Dark Yugi explained that this is a Shadow Game of " Duel Monsters " , where the cards the loser will know death as their Penalty Game . Kaiba replied that this was the extreme game he had been looking for and that he was glad he accepted the challenge . Kaiba ' s turn Kaiba Summoned " Battle Ox " . It attacked and destroyed " Blackland Fire Dragon " ( Dark Yugi ' s : 2000 → 1800 Life Points ) . Dark Yugi ' s turn Dark Yugi Summoned " Mystical Elf " in Defense Mode . Kaiba ' s turn Kaiba switched " Battle Ox " to Defense Mode and Set " Giant ' s Might " to use next turn . Dark Yugi wondered what kind of card Kaiba Set and worried that if " Battle Ox " gets much stronger , he would not be able to stop it . Dark Yugi ' s turn Dark Yugi drew " Skull Servant " , which was too weak to help him . Kaiba ' s turn Kaiba activated " Giant ' s Might " , equipping it to " Battle Ox " , increasing its ATK by 20 % ( " Battle Ox " : 1700 → 2040 ) . " Battle Ox " attacked and destroyed and " Mystical Elf " . Intermediate turns Over the next few turns , " Battle Ox " destroyed a number of Dark Yugi ' s monsters , including " Skull Servant " , " Mushroom Man " and several unnamed . Kaiba ' s turn Dark Yugi Summoned " Summoned Skull " and Kaiba wondered how Yugi got such a card and that it was one of the five strongest monsters in the game . ( In the English version , he said it was one of the five strongest Fiend s ) . " Summoned Skull " attacked and destroyed " Battle Ox " , dropping ( Kaiba : 1500 → 1040 Life Points ) . Intermediate turns " Summoned Skull " destroyed a number of Kaiba ' s monsters ( Kaiba : 1040 → 800 Life Points ) . Although his Deck had cards that could beat " Summoned Skull " , Kaiba thought that the odds of drawing one were low . However he thought that he could win using the " Blue - Eyes White Dragon " in his pocket . Kaiba ' s turn Kaiba added " Blue - Eyes White Dragon " to his hand , pretending to draw it . Kaiba Summoned " Blue - Eyes White Dragon " and Dark Yugi declared that that was Sugoroku ' s card , but Kaiba insisted that it was his own copy . Since " Blue - Eyes White Dragon " had 500 more ATK than " Summoned Skull " , Kaiba planned on winning by attacking with it . However the " Blue - Eyes White Dragon " refused to attack as it loyalties were with Sugoroku . Instead it destroyed itself . Dark Yugi ' s turn Dark Yugi used " Monster Reborn " to revive " Blue - Eyes White Dragon " and used it to attack Kaiba directly ( Kaiba : 800 → 0 Life Points ) . Aftermath . Dark Yugi inflicted the Experience of Death Penalty Game on Kaiba , causing Kaiba to believe his soul was trapped in a " Duel Monsters " card , causing him to be sent to the Duel Monsters Spirit World , where he experienced death at the hands of monsters .