Narcomoeba + Sifter of Skulls Combos

2 known combos featuring both cards in Commander

Infinite death triggers Infinite ETB Infinite LTB Infinite sacrifice triggers Infinite self-mill

Combo 1 with Mortuary + Undercity Informer

Results: Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers · Infinite self-mill
Steps
  1. Activate Undercity Informer by paying {1} and sacrificing Narcomoeba.
  2. When Narcomoeba dies, Mortuary and Sifter of Skulls trigger.
  3. Resolve the Mortuary trigger, putting Narcomoeba on top of your library from your graveyard.
  4. Resolve the Sifter of Skulls trigger, creating a 1/1 Eldrazi Scion creature token.
  5. Resolve the Undercity Informer ability, causing you to put Narcomoeba into your graveyard from the top of your library.
  6. Narcomoeba triggers, returning itself to the battlefield from your graveyard.
  7. Activate the Eldrazi Scion by sacrificing it, adding {C}.
  8. Repeat.

Combo 2 with Mortuary + Sanguine Spy

Results: Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers
Show steps
  1. Activate Sanguine Spy by paying {1} and sacrificing Narcomoeba.
  2. When Narcomoeba dies, Mortuary and Sifter of Skulls trigger.
  3. Resolve the Mortuary trigger, putting Narcomoeba on top of your library from your graveyard.
  4. Resolve the Sifter of Skulls trigger, creating a 1/1 Eldrazi Scion creature token.
  5. Resolve the Sanguine Spy ability, causing you to put Narcomoeba into your graveyard from the top of your library.
  6. Narcomoeba triggers, returning itself to the battlefield from your graveyard.
  7. Activate the Eldrazi Scion by sacrificing it, adding {C}.
  8. Repeat.
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