Yu - Gi - Oh ! GX - Episode 050 " Magna Chum Laude " , known as " Hayato VS Cronos ! Ayers Rock Sunrise ! " in the Japanese version , is the fiftieth episode of the " Yu - Gi - Oh ! GX " anime . It first aired in Japan on September 14 , 2005 and in the United States on April 4 , 2006 . Summary . Promotion exams were just around the corner at Duel Academy . Jaden Yuki and Syrus Truesdale simulate a Duel against one another , and Syrus wins , with Jaden having a bad case of test anxiety . Syrus reveals that Chumley Huffington had been up all night preparing for the exams and that this is his last chance - if he fails again , he ' ll have to leave Duel Academy for good ( in the Japanese version , he has failed his exams once , the English version changes this to twice ) . Later that day , the three sit in an art class , and Chumley has painted a picture of in Australia . Dr . Crowler then appears on the classroom ' s monitor and tells Chumley to report to Chancellor Sheppard ' s office . Sheppard reveals that Chumley has won a card design contest hosted by Industrial Illusions with a design similiar to what he just painted in class . Sheppard reveals that the card has been made , and hands him " Ayers Rock Sunrise " . Maximillion Pegasus appears on the monitor via a video phone call . He reveals that if Duel Academy is willing to recommend him , Pegasus will hire him on the spot as a card designer . Sheppard is willing to recommend him , but Crowler does not agree . He states he will should Chumley be able to defeat him in a Duel during the promotion exams the next day . However , should he lose , he ' ll be expelled . Chumley is nervous , but reminds himself that no matter the result , he does enjoy Dueling , so he needs to do his best . Before the Duel , Crowler reminds him that he will not go easy on him . Chumley begins by Set ting a monster . Crowler plays " Magnet Circle LV2 " to Special Summon " Ancient Gear " , with its effect activating , allowing him to Special Summon another " Ancient Gear " from his hand . He Tribute s them both to Summon " Ancient Gear Golem " . He attacks Chumley ' s Set monster , which is revealed to be " Des Koala " . Though Chumley still takes piercing damage from the attack , " Des Koala ' s " Flip Effect activates , dealing 400 damage to Crowler for each card in his hand . Chumley Summons " Eucalyptus Mole " in Defense Position and Sets a card . Crowler attacks with " Ancient Gear Golem " , again inflicting piercing damage . However , this activates " Eucalyptus Mole ' s " effect , letting Chumley Special Summon " Big Koala " from his Deck . Crowler Summons " Ancient Gear Soldier " in Defense Position and ends his turn . Chumley activates " Wild Nature ' s Release " , adding the DEF of " Big Koala " to its ATK , giving it enough strength to destroy " Ancient Gear Golem " and reduce Crowler to 1500 Life Points . He then activates his face - down " Beast Soul Swap " , returning " Big Koala " to his hand to Special Summon another Beast - type monster of the same Level . He chooses the same " Big Koala " . In this way , he circumvents " Wild Nature ' s Release ' s " cost of the affected monster ' s destruction during the End Phase . This also lets " Big Koala " attack again , and Chumley destroys " Ancient Gear Soldier " . Crowler plays " Pot of Greed " , drawing two cards . He then plays " Ancient Gear Factory " , which lets him remove monsters in his Graveyard from play to Normal Summon an " Ancient Gear " monster from his hand without Tribute , so long as the removed monsters have double the Summoned monster ' s level . He removes his two " Ancient Gears " , " Ancient Gear Soldier " and " Ancient Gear Golem " to Summon another " Ancient Gear Golem " . He attacks and destroys " Big Koala " , with Chumley activating his face - down " Animal Trail " to add " Des Kangaroo " from his Deck to his hand . Crowler activates " Ancient Gear Drill " , discard ing a card to Set a Spell Card from his Deck . Chumley draws " Ayers Rock Sunrise " and recalls when he saw the real thing . After failing last year , Chumley had taken a trip to Australia with his father , though in exchange , he was supposed to give up Dueling . He decided to toss his Deck off of Ayers Rock . However , he could not bring himself to do so . Chumley activates the card he designed himself , letting him Special Summon " Big Koala " from his Graveyard and reduce the attack of " Ancient Gear Golem " to 2600 - 200 points for each Beast , Beast - Warrior and Winged Beast - type monsters in his Graveyard . He activates " Polymerization " , fusing " Big Koala " with the " Des Kangaroo " in his hand to Fusion Summon " Master of Oz " . He attacks , but Crowler counters with his face - down " Limiter Removal " , doubling " Ancient Gear Golem ' s " attack and winning him the Duel . However , Crowler reveals that the point of the Duel was not to win or lose - but to test Chumley ' s improvements and growth as a Duelist . Having proven himself , Crowler agrees to offer his recommendation to Industrial Illusions . Featured Duels . Jaden Yuki vs . Syrus Truesdale ( Simulation Duel ) . Duel already in progress . Syrus controls " Patroid " ( 1200 / 1200 ) , " Gyroid " ( 1000 / 1000 ) , and " Drilloid " ( 1600 / 1600 ) in Attack Position . Jaden ' s hand contains " Elemental HERO Clayman " , " Elemental HERO Burstinatrix , and " Elemental HERO Rampart Blaster " Jaden ' s turn < br > Jaden Normal Summons " Elemental Hero Clayman " ( 800 / 2000 ) in Defense Position . Syrus ' turn < br > " Drilloid " attacks " Clayman " . Syrus activates the effect of " Drilloid " to destroy " Clayman " without applying damage calculation . One of Syrus ' two other monsters then attack directly ( Jaden ? → 0 ) . Chumley Huffington vs . Vellian Crowler . Turn 1 : Chumley < br > Chumley draws a monster and subsequently set s it . Turn 2 : Crowler < br > Crowler draws " Magnet Circle LV2 " and subsequently activates it to Special Summon " Ancient Gear " ( 100 / 800 ) from his hand in Attack Position . Since Crowler controls " Ancient Gear " , he Special Summons another " Ancient Gear " ( 100 / 800 ) from his hand in Attack Position . Crowler then Tribute s both " Ancient Gears " in order to Tribute Summon " Ancient Gear Golem " ( 3000 / 3000 ) in Attack Position . " Ancient Gear Golem " attacks and destroys Chumley ' s face - down monster , " Des Koala " ( 1100 / 1800 ) . " Ancient Gear Golem " then inflicts piercing damage to Chumley ( Chumley 4000 → 2800 ) . Since " Des Koala " was flipped face - up , its Flip Effect activates , inflicting 400 damage to Crowler for every card in his hand . Crowler currently has two cards in his hand ( Crowler 4000 → 3200 ) . Turn 3 : Chumley < br > Chumley draws . He then Normal Summons " Eucalyptus Mole " ( 800 / 1300 ) in Defense Position and Sets a card . Turn 4 : Crowler < br > Crowler draws " Ancient Gear Golem " . Crowler ' s hand contains " Ancient Gear Golem " , " Ancient Gear Soldier " , and " Emes the Infinity " . " Ancient Gear Golem " attacks and destroys " Eucalyptus Mole " . " Ancient Gear Golem " then inflicts piercing damage to Chumley ( Chumley 2800 → 1100 ) . Since " Eucalyptus Mole " was destroyed in battle , its effect activates , letting Chumley Special Summon " Big Koala " from his Deck ( 2700 / 2000 ) in Attack Position . Crowler then Normal Summons " Ancient Gear Soldier " ( 1300 / 1300 ) in Defense Position . Turn 5 : Chumley < br > Chumley draws " Wild Nature ' s Release " and subsequently activates it to increase " Big Koala ' s " ATK by its DEF ( " Big Koala " : 2700 → 4700 / 2000 ) , but " Big Koala " will be destroyed on Chumley ' s End Phase . " Big Koala " attacks and destroys " Ancient Gear Golem " ( Crowler 3200 → 1500 ) . Chumley then activates his face - down " Beast Soul Swap " to return " Big Koala " to his Chumley ' s hand and Special Summon " Big Koala " ( 2700 / 2000 ) from his hand in Attack Position ( Doing so lets Chumley circumvent the negative effect of " Wild Nature ' s Release " as " Big Koala " is no longer valid for the effect of " Wild Nature ' s Release " ) . " Big Koala " attacks and destroys " Ancient Gear Soldier " . Chumley then Sets a card . Turn 6 : Crowler < br > Crowler draws " Pot of Greed " and subsequently activates it to draw two cards ( " Ancient Gear Factory " and " Ancient Gear Drill " ) . Crowler then activates " Ancient Gear Factory " to remove the " Ancient Gear Golem " , " Ancient Gear Soldier " and two " Ancient Gears " from his Graveyard from play and Normal Summon another " Ancient Gear Golem " ( 3000 / 3000 ) in Attack Position without Tribute . " Ancient Gear Golem " attacks and destroys " Big Koala " ( Chumley 1100 → 800 ) . Since a monster Chumley controls was destroyed in battle , he activates his face - down " Animal Trail " to add " Des Kangaroo " from his Deck to his hand . Chumley ' s hand contains " Polymerization " , an unknown Trap Card , " The Big March of Animals " , and " Des Kangaroo " . Crowler then activates " Ancient Gear Drill " to discard " Emes the Infinity " and set a Spell Card from his Deck , but that set card cannot be activated this turn . Turn 7 : Chumley < br > Chumley draws " Ayers Rock Sunrise " and subsequently activates it to Special Summon " Big Koala " ( 2700 / 2000 ) from his Graveyard and reduce the ATK of " Ancient Gear Golem " by 200 for each Beast , Beast - Warrior and Winged Beast - type monster in his Graveyard . There are currently two ( " Ancient Gear Golem " : 3000 → 2600 / 3000 ) . Chumley then activates " Polymerization " to fuse " Big Koala " with " Des Kangaroo " in order to Fusion Summon " Master of Oz " ( 4200 / 3700 ) in Attack Position . " Master of Oz " attacks " Ancient Gear Golem " , but Crowler activates his face - down " Limiter Removal " to double the ATK of " Ancient Gear Golem " ( " Ancient Gear Golem " : 2600 → 5200 / 3000 ) until the End Phase . " Ancient Gear Golem " destroys " Master of Oz " ( Chumley 800 → 0 ) . Differences in adaptations . In the English version , Dr . Crowler is much more vindictive , and generally mocks any effort that Chumley makes until the end of the Duel , when he congratulates him on his improvements . In the Japanese version , Cronos admits when Hayato makes impressive moves and even contemplates losing by not activating " Limiter Removal " . The English version also cuts a series of flashbacks that Hayato has after his friends cheer him on . Featured cards . The following cards appeared in this episode . Cards in italics debuted here .