Activate Nomads en-Kor, targeting Cephalid Illusionist.
Mill 3.
Repeat this process until you mill your entire library.
When you mill Narcomoeba, put it on the battlefield.
Flashback Dread Return, sacrificing Nomads en-Kor, Cephalid Illusionist, and Narcomoeba, targeting Thassa's Oracle.
Resolve Thassa's Oracle's trigger with no cards in your library.

Infinite self-mill

Win the game

Cephalid Illusionist

Nomads en-Kor

Narcomoeba

Dread Return

Thassa's Oracle

Activate Altar of Dementia by sacrificing Narcomoeba.
Narcomoeba dies, triggering Mortuary, putting Narcomoeba on top of your library from your graveyard.
Resolve the Altar of Dementia ability, causing you to mill Narcomoeba from the top of your library.
Narcomoeba triggers, putting itself from your graveyard onto the battlefield.
Repeat.

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite sacrifice triggers

Mortuary

Altar of Dementia

Activate Carrion Feeder by sacrificing Narcomoeba.
When Narcomoeba dies, Selhoff Occultist and Mortuary trigger.
Resolve the Mortuary trigger, putting Narcomoeba from your graveyard on top of your library.
Resolve the Selhoff Occultist trigger, causing you to mill Narcomoeba from the top of your library.
Narcomoeba triggers, putting it from your graveyard onto the battlefield.
Resolve the Carrion Feeder ability from step 1, putting a +1/+1 counter on it.
Repeat.

Infinite +1/+1 counters on Carrion Feeder

Selhoff Occultist

Carrion Feeder

Activate Undercity Informer by paying {1} and sacrificing Narcomoeba.
When Narcomoeba dies, Mortuary and Pitiless Plunderer trigger.
Resolve the Mortuary trigger, putting Narcomoeba on top of your library from your graveyard.
Resolve the Pitiless Plunderer trigger, creating a Treasure token.
Resolve the Undercity Informer ability, causing you to put Narcomoeba into your graveyard from the top of your library.
Narcomoeba triggers, returning itself to the battlefield from your graveyard.
Activate the Treasure by tapping and sacrificing it, adding {1}.
Repeat.

Undercity Informer

Pitiless Plunderer

Activate Sanguine Spy by paying {1} and sacrificing Narcomoeba.
When Narcomoeba dies, Mortuary and Pitiless Plunderer trigger.
Resolve the Mortuary trigger, putting Narcomoeba on top of your library from your graveyard.
Resolve the Pitiless Plunderer trigger, creating a Treasure token.
Resolve the Sanguine Spy ability, causing you to put Narcomoeba into your graveyard from the top of your library.
Narcomoeba triggers, returning itself to the battlefield from your graveyard.
Activate the Treasure by tapping and sacrificing it, adding {1}.
Repeat.

Sanguine Spy

Activate Undercity Informer by paying {1} and sacrificing Narcomoeba.
When Narcomoeba dies, Mortuary and Pawn of Ulamog trigger.
Resolve the Mortuary trigger, putting Narcomoeba on top of your library from your graveyard.
Resolve the Pawn of Ulamog trigger, creating a 0/1 Eldrazi Spawn creature token.
Resolve the Undercity Informer ability, causing you to put Narcomoeba into your graveyard from the top of your library.
Narcomoeba triggers, returning itself to the battlefield from your graveyard.
Activate the Eldrazi Spawn by sacrificing it, adding {C}.
Repeat.

Pawn of Ulamog

Activate Sanguine Spy by paying {1} and sacrificing Narcomoeba.
When Narcomoeba dies, Mortuary and Pawn of Ulamog trigger.
Resolve the Mortuary trigger, putting Narcomoeba on top of your library from your graveyard.
Resolve the Pawn of Ulamog trigger, creating a 0/1 Eldrazi Spawn creature token.
Resolve the Sanguine Spy ability, causing you to put Narcomoeba into your graveyard from the top of your library.
Narcomoeba triggers, returning itself to the battlefield from your graveyard.
Activate the Eldrazi Spawn by sacrificing it, adding {C}.
Repeat.

Activate Undercity Informer by paying {1} and sacrificing Narcomoeba.
When Narcomoeba dies, Mortuary and Sifter of Skulls trigger.
Resolve the Mortuary trigger, putting Narcomoeba on top of your library from your graveyard.
Resolve the Sifter of Skulls trigger, creating a 1/1 Eldrazi Scion creature token.
Resolve the Undercity Informer ability, causing you to put Narcomoeba into your graveyard from the top of your library.
Narcomoeba triggers, returning itself to the battlefield from your graveyard.
Activate the Eldrazi Scion by sacrificing it, adding {C}.
Repeat.

Sifter of Skulls

Activate Sanguine Spy by paying {1} and sacrificing Narcomoeba.
When Narcomoeba dies, Mortuary and Sifter of Skulls trigger.
Resolve the Mortuary trigger, putting Narcomoeba on top of your library from your graveyard.
Resolve the Sifter of Skulls trigger, creating a 1/1 Eldrazi Scion creature token.
Resolve the Sanguine Spy ability, causing you to put Narcomoeba into your graveyard from the top of your library.
Narcomoeba triggers, returning itself to the battlefield from your graveyard.
Activate the Eldrazi Scion by sacrificing it, adding {C}.
Repeat.

Activate Grinding Station by tapping it and sacrificing Narcomoeba, targeting yourself.
When Narcomoeba dies, Mortuary triggers, putting Narcomoeba on top of your library from your graveyard.
Resolve the Grinding Station ability, causing you to mill three cards.
Narcomoeba triggers, returning itself to the battlefield from your graveyard.
When Narcomoeba enters the battlefield, Grinding Station triggers, untapping Grinding Station.
Repeat.

Grinding Station

Biotransference

Encroaching Mycosynth

Mycosynth Lattice

Activate Undercity Informer by paying {1} and sacrificing Narcomoeba.
When Narcomoeba dies, Mortuary triggers, putting Narcomoeba on top of your library from your graveyard.
Resolve the Undercity Informer ability, causing you to put Narcomoeba into your graveyard from the top of your library.
Narcomoeba triggers, returning itself to the battlefield from your graveyard.
When Narcomoeba enters the battlefield, Mana Echoes triggers, adding at least {C}.
Repeat.
If you control at least one other Illusion, this combo will net infinite colorless mana.

Infinite colorless mana

Mana Echoes

Activate Sanguine Spy by paying {1} and sacrificing Narcomoeba.
When Narcomoeba dies, Mortuary triggers, putting Narcomoeba on top of your library from your graveyard.
Resolve the Sanguine Spy ability, causing you to put Narcomoeba into your graveyard from the top of your library.
Narcomoeba triggers, returning itself to the battlefield from your graveyard.
When Narcomoeba enters the battlefield, Mana Echoes triggers, adding at least {C}.
Repeat.
If you control at least one other Illusion, this combo will net infinite colorless mana.

Combos with "Narcomoeba"