Yu - Gi - Oh ! ARC - V - Episode 123 " 123 Fusion Destruction " , known as " The Glorious Machine Dragon " in the Japanese version , is the one hundred and twenty - third episode of the " Yu - Gi - Oh ! ARC - V " anime . It first aired in Japan on September 18th , 2016 and in Canada on December 30 , 2017 . It became available with official subtitles via Crunchyroll on November 22 , 2017 . Featured Duel : Alexis Rhodes vs . Yuri . Turn 1 : Alexis Alexis activate s " Machine Angel Absolute Ritual " , letting her Tribute " Cyber " monsters from her hand or field or return " Cyber " monsters from her Graveyard to her Deck to Ritual Summon a " Cyber Angel " Ritual Monster . She Tributes " Cyber Tutubon " from her hand to Ritual Summon " Cyber Angel Natasha " ( 1000 / 1000 ) in Defense Position . As " Cyber Tutubon " was used for a Ritual Summon this turn , its effect activates , letting her add a Ritual Spell Card from her Graveyard to her hand . She adds " Absolute Ritual " and activates it , returning " Tutubon " to her Deck to Ritual Summon a second copy of " Natasha " ( 1000 / 1000 ) in Defense Position . Alexis activates the effects of both copies of " Natasha " , letting her target a monster she control s and gain Life Points equal to half its ATK . She targets the other copy of " Natasha " both times ( Alexis : 4000 → 4500 → 5000 ) . Turn 2 : Yuri Yuri activates the Continuous Spell Card , " Ancient Gear Fortress " , preventing " Ancient Gear " monsters he controls from being targeted or destroy ed by his opponent ' s card effects during the turn they are Normal or Special Summon ed . It will also prevent the opponent from activating any cards or effects in response to the activation of any " Ancient Gear " card . As he controls no monsters , Yuri activates " Ancient Gear Catapult " , letting him target and destroy a face - up card he controls and Special Summon an " Ancient Gear " monster from his Deck , ignoring the Summoning conditions . He destroys " Fortress " and Special Summons " Ancient Gear Gadget " ( 500 / 2000 ) . As " Fortress " was destroyed , its effect activates , letting Yuri Special Summon an " Ancient Gear " monster from his hand or Graveyard , but he may not Special Summon any monsters for the rest of this turn except " Ancient Gear " monsters . He Special Summons " Ancient Gear Wyvern " from his hand in Attack Position ( 1700 / 1200 ) . As it was Normal or Special Summoned , its effect activates , letting Yuri add an " Ancient Gear " monster from his Deck to his hand . He adds " Ancient Gear Reactor Dragon " . Yuri activates the effect of " Ancient Gear Gadget " , letting him declare the name of another " Gadget " monster and change the name of " Ancient Gear Gadget " to that card ' s name until the End Phase . He declares " Red Gadget " . Yuri Tributes " Wyvern " and " Gadget " to Tribute Summon " Reactor Dragon " ( 3000 / 3000 ) in Attack Position . " Reactor Dragon " attack s " Natasha " . As another " Cyber " monster she controls is being attacked , Alexis activates the effect of the other " Natasha " , which would negate the attack , but the effect of " Reactor Dragon " prevents the opponent from activating Spell or Trap Card s or the effects of monsters until the end of the Damage Step . The attack continues and " Natasha " is destroyed , with the effect of " Reactor Dragon " inflicting piercing battle damage as it was Tribute Summoned by Tributing an " Ancient Gear " monster ( Alexis : 5000 → 3000 ) . As " Reactor Dragon " was Tribute Summoned by Tributing a " Gadget " monster , it may attack twice per Battle Phase . " Reactor Dragon " attacks and destroys the second " Natasha " , inflicting piercing battle damage ( Alexis : 3000 → 1000 ) . Yuri Set s a card . Turn 3 : Alexis Alexis activates the effect of the " Natasha " in her Graveyard , banish ing another " Cyber Angel " monster from her Graveyard to Special Summon " Natasha " and take control of a monster her opponent controls . She banishes one copy of " Natasha " , Special Summons the other copy ( 1000 / 1000 ) in Defense Position and takes control of " Reactor Dragon " . Alexis activates the effect of " Natasha " , increasing her Life Points by half the ATK of " Reactor Dragon " ( Alexis : 1000 → 2500 ) . Alexis begins to declare an attack , but Yuri activates his face - down " Unfinished Ancient Gear " before she can finish and allow the effect of " Reactor Dragon " to prevent the activation of cards . This lets him Special Summon an " Ancient Gear " monster from his hand in Defense Position , ignoring the Summoning conditions . That monster cannot be destroyed by battle this turn , but its ATK and DEF will be halved . He Special Summons " Ancient Gear Golem " ( 3000 / 3000 → 1500 / 1500 ) . " Reactor Dragon " attacks " Golem " , which is not destroyed by battle , but piercing battle damage is inflicted ( Yuri : 4000 → 2500 ) . " Reactor Dragon " attacks " Golem " a second time ( Yuri : 2500 → 1000 ) . Alexis activates the Continuous Spell Card " Fusion Destruction " by send ing a " Polymerization " in her hand to the Graveyard . This lets her look at her opponent ' s Deck and banish up to three " Polymerization " and / or " Fusion " Spell / Trap Cards from it , then inflict 300 damage for each one . She sends three copies of " Polymerization " ( Yuri : 1000 → 100 ) . Turn 4 : Yuri Yuri activates " Ancient Gear Workshop " , letting him add an " Ancient Gear " monster from his Graveyard to his hand . He adds " Wyvern " . He Normal Summons " Wyvern " ( 1700 / 1200 ) , whose effect activates as it was Normal or Special Summoned , letting him add a " Ancient Gear " monster from his Deck to his hand . He adds " Ancient Gear Box " . He then activates " Super Polymerization " , letting him discard a card to Fusion Summon a Fusion Monster from his Extra Deck , using monsters from either side of the field as Materials . Cards or effects cannot be activated in response to this card ' s activation , preventing Alexis from activating the effect of " Fusion Destruction " , which would let her negate the activation of a " Polymerization " and / or " Fusion " Spell / Trap Card , destroy it and inflict 300 damage . Yuri discards " Box " to fuse " Golem " and " Wyvern " from his field with " Reactor Dragon " from Alexis ' field to Fusion Summon " Ultimate Ancient Gear Golem " ( 4400 / 3400 ) in Attack Position . " Ultimate Golem " attacks and destroys " Natasha " , with the effect of " Ultimate Golem " inflicting piercing battle damage ( Alexis : 2500 → 0 ) . Featured cards . The following cards appeared in this episode . Cards in italics debuted here .