Yami Yugi, Seto Kaiba, Lumis and Umbra's Duel

Yami Yugi, Seto Kaiba, Lumis and Umbra faced each other in a game of Duel Monsters, during the Battle City arc, in the Yu-Gi-Oh! anime. It is based on Dark Yugi, Seto Kaiba and the Rare Hunter Tag's Duel in the Yu-Gi-Oh! (manga).

Prior Events
After Joey Wheeler's duel with Mako Tsunami, Tristan Taylor parts from the group to pick up Serenity Wheeler. Suddenly, Joey, Téa Gardner and Solomon Muto find a young man calling himself Namu carrying an injured Bakura Ryou. Mr. Muto offers to take Bakura to the hospital. A short while later, Joey and Tea are surrounded by Rare Hunters and are captured.

Suddenly, outside an office building, two cloaked duelists arrive and they inform Yugi Muto and Seto Kaiba that their friends are now in their possession and if they want to find them, they will have to duel them for that information. The two lead Yugi, now in his alter-ego, and Kaiba to the top of a building and introduce themselves as Lumis and Umbra, the two duelists they met before, but now they are taking part in another duel. In this duel there are devices placed under the glass of each duelists feet. The moment the display on the devices, which are life points, reach zero, they'll cause the glass to shatter and the duelist to fall into a vortex leading to the Shadow Realm. To save their friends, the duel commences.

Featured Duel: Yami Yugi and Seto Kaiba vs. Lumis and Umbra
The turn order is as follows: Lumis → Yugi → Umbra → Kaiba

Turn 1: Lumis

Lumis draws. He then Sets two cards.

Turn 2: Yami Yugi

Yami Yugi draws. He then Normal Summons "Beta The Magnet Warrior" (1700/1600) in Defense Position.

Turn 3: Umbra

Umbra draws. He then Normal Summons "Shining Abyss" (1600/1800) in Defense Position. Lumis then activates his face-down "Mask of Brutality", equipping it to "Shining Abyss" and increasing its ATK by 1000 as well as decreasing its DEF by 1000 ("Shining Abyss": 1600 → 2600/1800 → 800). During each of Lumis' Standby Phases, he must pay 1000 Life Points or else "Mask of Brutality" will be destroyed. Umbra then activates "Masked Doll" to negate the cost of "Mask of Brutality".

Turn 4: Kaiba

Kaiba draws. He then Sets two cards. Kaiba's hand contains "Saggi the Dark Clown", "Monster Reborn", "Vorse Raider", and "Battle Ox". Kaiba then Normal Summons "Vorse Raider" (1900/1200) in Attack Position.

All players still have 4000 Life Points remaining.

Lumis controls "Mask of Brutality" (which is equipped to "Shining Abyss") and one set card.

Yami Yugi controls "Beta The Magnet Warrior" (1700/1600) in Defense Position

Umbra controls "Shining Abyss" (2600/800) in Defense Position and "Masked Doll".

Kaiba controls "Vorse Raider" (1900/1200) in Attack Position and two set cards.

Turn 5: Lumis

Lumis draws "Mask of the Accursed" and subsequently activates it, equipping it to Yami Yugi's "Beta The Magnet Warrior". Now the equipped monster can't attack and if it's the only monster Yugi controls, Lumis or Umbra can attack Yami Yugi directly. During each of Yami Yugi's Standby Phases, "Mask of the Accursed" will inflict 500 damage to him. Lumis Sets a card.

Turn 6: Yami Yugi

Yami Yugi draws "Beast of Gilfer". The effect of "Mask of the Accursed" effect activates (Yami Yugi 4000 → 3500). Yami Yugi attempts to Tribute "Beta The Magnet Warrior" in order to Tribute Summon "Beast of Gilfer", but Lumis activates his face-down "Mask of Restrict". Now Yami Yugi and Kaiba are forbidden from tributing any of their monsters for a Tribute Summon. Yami Yugi then Sets a card and Normal Summons "Kuriboh" (300/200) in Defense Position.

Turn 7: Umbra

Umbra draws. He then Sets a card and switches "Shining Abyss" (2600/800) to Attack Position. "Shining Abyss" attacks "Vorse Raider", but Kaiba activates his face-down "Ring of Destruction" to destroy "Shining Abyss" and inflict damage to both Kaiba and Umbra equal to the ATK of "Shining Abyss". Lumis then activates his face-down "Curse Transfer" to change the target of "Ring of Destruction" to "Vorse Raider"; "Vorse Raider" is destroyed. Kaiba then activates his face-down "Ring of Defense" to protect his Life Points from the effect of "Ring of Destruction", but Umbra activates his face-down "Spell Transfer" to negate the effect of "Ring of Defense" and activate the effect of "Spell Transfer" as the effect of "Ring of Defense", allowing Umbra to protect himself from the effect of "Ring of Destruction" (Seto Kaiba 4000 → 2100).

A replay then occurs and Umbra uses "Shining Abyss" to attack Kaiba directly, but Yami Yugi activates his face-down "Multiply" to create a large wall made up of "Kuribohs". The attack destroys part of the wall, but the wall quickly regenerates shortly after the attack is through.

Turn 8: Kaiba

Kaiba draws "Blue-Eyes White Dragon". He then Sets a card and Normal Summons "Battle Ox" (1700/1000) in Defense Position.

Turn 9: Lumis

Lumis draws "Mask of Dispel" and subsequently activates it by targeting "Multiply". Now the targeted Magic Card's effects are negated and during each of Yugi's Standby Phases, he will take 500 damage. With "Multiply" negated, the "Kuriboh" wall is reduced back down to just one "Kuriboh". Lumis then Normal Summons "Grand Tiki Elder" (1500/800) in Attack Position. "Grand Tiki Elder" attacks and destroys "Kuriboh".

Turn 10: Yami Yugi

Yami Yugi's hand contains "Card of Destruction", "Beast of Gilfer", "Berfomet", and "Shift". Yami Yugi draws "Chain Destruction".The effects of "Mask of the Accursed" and "Mask of Dispel" activate (Yami Yugi 3500 → 3000 → 2500). Yami Yugi Sets a card.

Turn 11: Umbra

Umbra draws. He then activates "Curse of the Masked Beast" to Tribute his "Shining Abyss" and Lumis' "Grand Tiki Elder" and Ritual Summon "The Masked Beast" (3200/1800) in Attack Position.

"The Masked Beast" attacks Yami Yugi directly, but Kaiba blocks the attack with "Battle Ox". "The Masked Beast" destroys "Battle Ox". Yami Yugi then activates his face-down "Card Destruction" to make every duelist discard their hand and draw the same numbers of cards they discarded. Since "Beast of Gilfer" was sent to the Graveyard, its effect activates, allowing Yami Yugi to equip it to "The Masked Beast" and decrease its ATK by 500 ("The Masked Beast": 3200 → 2700/1800), but this isn't known to the other players yet.

Turn 12: Kaiba

Kaiba draws. He then activates his face-down "Monster Reborn" to Special Summon "Blue-Eyes White Dragon" (3000/2500) from his Graveyard in Attack Position.

Lumis has 4000 Life Points and controls "Mask of the Accursed" (equipped to "Beta The Magnet Warrior"), "Mask of Restrict", and "Mask of Dispel" (which is targeting Yugi's "Multiply").

Yami Yugi has 2500 Life Points remaining and controls "Beta The Magnet Warrior" (1700/1600) in Defense Position and "Multiply".

Umbra has 4000 Life Points remaining and controls "The Masked Beast" (who is secretly equipped with Yugi's "Beast of Gilfer") (2700/1800) in Attack Position and "Masked Doll".

Kaiba has 2100 Life Points remaining and controls "Blue-Eyes White Dragon" (3000/2500) in Attack Position.

Turn 12: Kaiba

Kaiba has just managed to revive "Blue-Eyes White Dragon" via "Monster Reborn". "Blue-Eyes White Dragon" attacks and destroys "The Masked Beast" (Umbra 4000 → 3700). At this point, Yami Yugi reveals that he had used the effect of "Beast of Gilfer" last turn to equip it to "The Masked Beast" and decrease its ATK by 500.

Turn 13: Lumis

Lumis draws a monster and subsequently sets it. He then Sets two cards.

Turn 14: Yami Yugi

Yami Yugi draws. During Yami Yugi's Standby Phase, the effects of "Mask of the Accursed" and "Mask of Dispel" activate (Yami Yugi 2500 → 2000 → 1500). Yami Yugi Sets a card and Normal Summons "Alpha The Magnet Warrior" (1400/1700) in Attack Position. "Alpha The Magnet Warrior" attacks and destroys Lumis' Set Monster. It's revealed to be "Melchid the Four-Face Beast" (1500/1200).

Turn 15: Umbra

Umbra draws "Rogue Doll" and subsequently Normal Summons it (1600/1000) in Attack Position. "Rogue Doll" attacks "Blue-Eyes White Dragon". Lumis then activates his face-down "Mask of Weakness" to decrease the ATK of "Blue-Eyes White Dragon" by 700 ("Blue-Eyes White Dragon": 3000 → 2300/2500). Lumis then activates his face-down "Mask of Brutality" to equip the latter to "Rogue Doll", increase its ATK by 1000, and decrease its DEF by 1000 ("Rogue Doll": 1600 → 2600/1000 → 0). Yami Yugi then activates his face-down "Mystical Refpanel" to switch the target of "Mask of Brutality" to "Blue-Eyes White Dragon" ("Rogue Doll": 2600 → 1600/0 → 1000) ("Blue-Eyes White Dragon": 2300 → 3300/2500 → 1500). "Blue-Eyes White Dragon" then destroys "Rogue Doll" (Umbra 3700 → 2000). Umbra Sets a card. On Umbra's End Phase, "Mask of Brutality" is destroyed due to the effect of "Mystical Refpanel" ("Blue-Eyes White Dragon": 3300 → 2300/1500 → 2500). At the same time, the effect of "Mask of Weakness" expires ("Blue-Eyes White Dragon": 2300 → 3000/2500).

Turn 16: Kaiba

Kaiba draws. "Blue-Eyes White Dragon" attacks Umbra directly, but Umbra activates his face-down "Mask of Impregnability" to make all Battle Damage he takes from direct attacks this turn 0. Kaiba then asks Lumis what would have happened if "Blue-Eyes White Dragon" attacked him instead to make Lumis wonder if Umbra would have protected him. This causes a break between them.

Turn 17: Lumis

Lumis draws "Pot of Greed" and subsequently activates it to draw two cards. He then Sets a card. Lumis activates "Card Exchange" to switch the cards in his hand with those in Umbra's hand. Lumis has no cards in his hand, so he just takes the cards Umbra has. Lumis then activates his face-down "Chosen One" to select one monster card and two non-monsters cards from his hand, place them face-down, and randomly select one. If it is the monster, Lumis can summon it, ignoring the summoning conditions, but if one of the non-monster cards is selected then all cards selected are sent to the Graveyard. The monster is selected, so Lumis Special Summons "Masked Beast Des Gardius" (3300/2500) in Attack Position, ignoring the Summoning Conditions.

Aftermath
The platform Umbra is standing on shatters and Umbra himself falls into the vortex. He tries to pull a parachute but even though the chute opens, it's too late, as Umbra's mind is sent to the Shadow Realm. Yami and Kaiba get into an argument when suddenly, Marik, who is controlling Lumis, informs Yugi that Joey and Tea are now his mind slaves. Furious, Kaiba asks him where Mokuba but Lumis falls unconscious. Suddenly, a helicopter appears with Mokuba inside it. Kaiba reluctantly agrees to help Yami save his friends since Tea saved Mokuba.