Yu - Gi - Oh ! GX - Episode 073 " Source of Strength " , known as " Kenzan VS Saiou ! It ' s Dinosaur DNA - don " in the Japanese version , is the seventy - third episode of the " Yu - Gi - Oh ! GX " anime . It first aired in Japan on February 22 , 2006 and in the United States on October 11 , 2006 . Summary . Sartorius sits at his headquarters , making further predictions with his tarot cards . He determines that though both Jaden Yuki and Aster Phoenix are influencing his destiny , there is a third person . He journeys to Duel Academy once more to determine who that person might be . He realizes that the person he seeks is Tyranno Hassleberry , who himself realizes that Sartorius is the one that Chazz Princeton has been raving about in regards to the Society of Light . Sartorius challenges Hassleberry to a Duel , while promising to set Chazz back to normal should Hassleberry win . However , Sartorius has never used a Duel Disk before , so Hassleberry much explain to him how it works . The Duel goes quite evenly , with both players being reduced to only a few hundred Life Points in a few turns . Sartorius wins by using " Reversal of Fate " to change the effect s of his " Arcana Force " monsters . Despite his loss , Hassleberry is not converted to the Society of Light , much to Sartorius ' shock . Hassleberry explains that in the past , he had excavated some Dinosaur fossils . His leg had been injured , and so the bone had been replaced by the fossilized Dinosaur bone he had uncovered . He claims that this " Dinosaur DNA " is what grants him immunity to the powers of Sartorius . A few days later , its revealed that Sartorius has officially enrolled at Duel Academy as a student . Featured Duel : Tyranno Hassleberry vs . Sartorius . Turn 1 : Hassleberry < br > Hassleberry draws " Giant Rex " and subsequently Normal Summons it ( 2000 / 1200 ) in Attack Position . Turn 2 : Sartorious < br > Sartorius draws " Reversal of Fate " . He then Normal Summons " Arcana Force I - The Magician " ( 1100 / 1100 ) in Attack Position . Since " The Magician " was summoned , it begins to rotate . It lands upright , so whenever a Spell Card is activated , the original ATK of " The Magician " will be doubled . Sartorius then activates " Future Vision " which allows him to pick up cards from Hassleberry ' s Deck until he picks up a monster . Should that monster be of the same Type as a face - up monster on Hassleberry ' s side of the field , Sartorius must return all the picked up cards to Hassleberry ' s Deck and Hassleberry will gain 1000 Life Points . Sartorius picks up " New Ultra Evolution " and " Ultimate Tyranno " and the latter monster is the same Type as " Giant Rex " ( Hassleberry 4000 → 5000 ) . The upright effect of " The Magician " activates ( " The Magician " : 1100 → 2200 / 1100 ) . " The Magician " attacks and destroy s " Giant Rex " ( Hassleberry 5000 → 4800 ) . Sartorius then Set s two cards . On Sartorius ' s End Phase , the effect of " The Magician " expires ( " The Magician " : 2200 → 1100 / 1100 ) . Turn 3 : Hassleberry < br > Hassleberry draws . He then Normal Summons " Archeonys " ( 300 / 1300 ) in Attack Position . Hassleberry then Activates " New Ultra Evolution " to Tribute " Archeonys " and Special Summon " Dark Tyranno " ( 2600 / 1800 ) in Attack Position . The upright effect of " The Magician " activates ( " The Magician " : 1100 → 2200 / 1100 ) . " Dark Tyranno " attacks and destroys " The Magician " ( Sartorius 4000 → 3600 ) . Turn 4 : Sartorious < br > Sartorius draws . He then activates " Pentacle of Ace " , which rotates upon activation . It lands upright , so Sartorius draw s a card and gains 500 Life Points ( Sartorius 3600 → 4100 ) . Sartorius then Normal Summons " Arcana Force VII - The Chariot " ( 1700 / 1700 ) in Attack Position . Since " The Chariot " was summoned , it begins to rotate . It lands upside down , so it will be Special Summoned to Hassleberry ' s side of the Field when it is destroyed in battle . " The Chariot " attacks " Dark Tyranno " . " Dark Tyranno " destroys " The Chariot " ( Sartorius 4100 → 3200 ) . Since " The Chariot " was destroyed in battle , it is revived ( 1700 / 1700 ) in Attack Position and under Hassleberry ' s control . " The Chariot " rotates upon being summoned . It lands upside down once more . Sartorius then activates " Suit of Sword X " , which rotates upon activation . It stops upright , so all monsters on Hassleberry ' s side of the Field are destroyed . Sartorius then activates his face - down " Ace of Wand " , which rotates upon activation . It lands upside down , so Hassleberry takes damage equal to the combined ATK of his destroyed monsters ( Hasslebery 4800 → 500 ) . Turn 5 : Hassleberry < br > Hassleberry draws " Ultimate Tyranno " . He then Normal Summons " Dyna Base " ( 0 / 2100 ) in Attack Position . Hassleberry then Tributes " Dyna Base " and the " Ultimate Tyranno " from his hand in order to Special Summon " Dyna Tank " ( ? / 2100 ) in Attack Position . Due to the effect of " Dyna Tank " , its ATK is equal to the ATK of the Dinosaur - type monster used for its summon ( " Dyna Tank " : ? → 3000 / 2100 ) . " Dyna Tank " attacks directly ( Sartorius 3200 → 200 ) . Turn 6 : Sartorious < br > Sartorius draws . He then activates " Necro Sacrifice " to target the " Arcana Force VIII - The Strength " in his hand and allow himself to Normal Summon " The Strength " without Tributing by Special Summoning " The Chariot " ( 1700 / 1700 ) from his Graveyard to Hassleberry ' s side of the Field . Hassleberry chooses to Summon " The Chariot " in Attack Position . " The Chariot " rotates upon being summoned . It lands upside down . Sartorius then Normal Summons " Arcana Force VIII - The Strength " ( 1800 / 1800 ) in Attack Position without any Tributes . Since " The Strength " was summoned , it begins to rotate . It lands upright , so Sartorius can switch control of one monster of the field . He targets " Dyna Tank " for the upright effect of " The Strength " , but the effect of " Dyna Tank " activates in response , switching the target for the effect of " The Strength " to " The Strength " itself and giving control of " The Strength " to Hassleberry . Sartorius then activates his face - down " Reversal of Fate " to switch the direction of all " Arcana Force " monsters on the field ; " The Chariot " is now upright and " The Strength " is now upside down . Due to the Tails effect of " The Strength " , Sartorius gains control of all monsters Hassleberry controls besides " The Strength " . " Dyna Tank " attacks and destroys " The Strength " ( Hassleberry 500 → 0 ) . Differences in adaptations . In the Japanese version , Sartorius enters Duel Academy as a third - year student . This is changed to first - year in the English version . Errors . When Sartorius plays " Ace of Wand " in the dub , he incorrectly states that he - himself - will either gain or take damage , when it ' s Hassleberry who takes the effect . Featured cards . The following cards appeared in this episode . Cards in italics debuted here .