Slifer the Sky Dragon ( character ) Slifer the Sky Dragon , known as Sky Dragon of Osiris in the Japanese version , is a character version of the card " Slifer the Sky Dragon " . Slifer appears in the manga and anime , as one of the most powerful monster spirits , the Egyptian God s . In the Japanese anime and manga , its card is called " Saint Dragon - The God of Osiris " . Appearance . Slifer is a large , serpentine red - skinned , black - bellied dragon with spikes running down its body . Its wings are bat - like in form , with two thumb claws . Slifer ' s head has two mouths ; the bottom jaw of the smaller top set is part of the top jaw of the larger set . The last tooth at each cheek is larger than the others . Slifer ' s head is crested with four spikes protruding horizontally , and two larger ones from the back of the head curving vertically ; the sapphire common to the Egyptian Gods is nestled at the front of the crest . Its tail crest is shaped in a similar manner , but with a single flattened spike at the tip rather than two spikes . Slifer has short limbs with three - toed feet . It is the only Egyptian God whose appearance remains constant in the anime between the present and the Memory World arc . Biography . Ancient Egypt . Slifer is one of the three Egyptian God s , along with Obelisk the Tormentor and The Winged Dragon of Ra . These monsters were only capable of being summoned by the Pharaoh . When Atem spotted Thief Bakura fleeing from the palace after he had attacked Aknadin , he chased after him on horseback . Atem allowed Slifer to be struck in order to protect innocent civilians from Diabound ' s attacks and then got Slifer to force the battle into the sky . However Diabound was able to disappear into the darkness and attack Slifer from behind . Atem pretended to surrender his Millennium Puzzle in order to distract Thief Bakura while he had Slifer sneak up on him . However Bakura got Diabound to make a similar sneak attack on the Pharaoh . After the priests arrived , Aknadin stabbed the stone slab of Slifer , destroying it . By defeating Slifer , Diabound gained its power , including its " Thunder Force " attack . Battle City . 3000 years later , Maximillion Pegasus created cards depicting the three Egyptian Gods , for his game " Duel Monsters " . However the souls of the Gods came to dwell in the cards , making them powerful weapons . On realizing this , Pegasus regarded their creation as one of his greatest mistakes . He tried to destroy the God Cards , but could not bring himself to do it , so he had the Egyptian supreme council of antiquities bury the cards in different locations in the Valley of the Kings . The Rare Hunters managed to steal the " Slifer the Sky Dragon " and " The Winged Dragon of Ra " cards . However the Egyptian supreme council of antiquities was able to prevent them finding the " Obelisk the Tormentor " card . Ishizu Ishtar , from the council , later gave it to Seto Kaiba , so that he would host the Battle City tournament to retrieve the other two . The leader of the Rare Hunters , Marik Ishtar entered the Battle City tournament with the " Slifer " and " Ra " God cards . Using Strings as his puppet , he Dueled Yami Yugi in the preliminaries and used " Slifer the Sky Dragon " in the Duel . However Yami managed to win the Duel and won the " Slifer " card through the tournament rules . Yami Yugi used " Slifer the Sky Dragon " in his semi final Duel against Yami Bakura . Summoning it and attacking Yami Bakura became Yami Yugi ' s only way of winning the Duel . Marik exploited this , by having Yami Bakura remove his control over Bakura Ryou ' s body . Ryo , who was injured and significantly weaker than Yami Bakura , would not be able to withstand an attack from Slifer , making Yami Yugi reluctant to attack . However , Yami Bakura took back control of Ryo ' s body and urged him to attack , assuring him Ryo would be okay . During Yami Yugi and Kaiba ' s semi final Duel , they got " Slifer the Sky Dragon " and " Obelisk the Tormentor " to battle . They were both destroyed when their ATK became equal , which caused Yami and Kaiba to see a vision of an ancient city . Here Slifer and Obelisk were turned to stone , while Priest Seto and Pharaoh Atem battled . Yami used Slifer in his final Duel against Yami Marik , only for it to be destroyed by " Egyptian God Phoenix " . Yami later revived it to shield his " Obelisk " from one of the attacks from " Egyptian God Phoenix " . Doma . In order to regain his memories , Yami Yugi presented the three Egyptian Gods to the stone tablet in the museum . However , the God cards began to crackle with dark energy as Dartz drained their power . Yami was then interrupted as Duel Monster spirits began appearing throughout the city . Later that day , Dartz ' s men broke into Kame Game and stole the God Cards . Dartz placed the cards in the mouths of three stone serpents in order to use their power to summon the Great Leviathan . After defeating Dartz in a Duel , Yami retrieved the Egyptian God cards , though their strength had already been drained . After Yami Yugi ' s soul had been absorbed into the Great Leviathan , the other souls Dartz had captured were able to lend him their strength . With it , Yami called out , " In the name of the Pharaoh , awaken ! " and summoned the three Egyptian Gods . By summoning them , Yami was also able to free himself , Joey Wheeler and Seto Kaiba from the Leviathan . Obelisk , Slifer and Ra engaged in battle with the Great Leviathan . Empowered by the light of other people ' s souls , they defeated its main body . However the Leviathan reappeared in a different form within Dartz , which Yami managed to defeat . Pyramid of Light . Kaiba Dueled and defeated Pegasus to obtain a card capable of defeating the Egyptian God cards . Anubis added an extra card , " Pyramid of Light " to Kaiba ' s prize . Kaiba went on to face Yami Yugi in a Duel and used " Obligatory Summon " to force him to Summon the Egyptian God cards and then activated " Pyramid of Light " , removing the Gods from play . Memory World . When Yami Yugi entered the Memory World , he relived some of his life as Pharaoh Atem , and fought the battle against Thief Bakura , in which he summoned Slifer , again . The Pharaoh used the three Egyptian Gods to battle Zorc Necrophades . However Zorc managed to overpower them and turn them into stone . Upon relearning his name , Atem was able to Summon the three Gods again , this time from the cards in Yugi ' s Deck . He then combined them into The Creator God of Light , Horakhty , who defeated Zorc . Yugi and Atem constructed separate Decks for the Ceremonial Battle , which Atem needed to lose in order to pass on to the afterlife . Despite needing to lose , Atem gave the Duel his all . He included the three Egyptian God cards in his Deck and managed to Summon the three of them at once in the Duel . However Yugi was able to destroy them and win . Altered timeline . Jaden Yuki was sent back in time to Duel Yugi Muto . Towards the end of the Duel , Yugi switched to Yami Yugi , who Summoned " Slifer the Sky Dragon " , stating that Jaden was of having a god as his opponent .