Mortuary + Sifter of Skulls Combos

3 known combos featuring both cards in Commander

Infinite death triggers Infinite ETB Infinite LTB Infinite sacrifice triggers Infinite storm count

Combo 1 with Digsite Conservator + Ashnod's Altar

Results: Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers · Infinite storm count
Steps
  1. Activate Ashnod's Altar by sacrificing Digsite Conservator, adding {C}{C}.
  2. When Digsite Conservator dies, it, Mortuary and Sifter of Skulls trigger.
  3. Resolve the Sifter of Skulls trigger, creating a 1/1 Eldrazi Scion creature token.
  4. Activate Ashnod's Altar by sacrificing the Eldrazi Scion, adding {C}{C}.
  5. Resolve the Mortuary trigger, putting Digsite Conservator on top of your library from your graveyard.
  6. Resolve the Digsite Conservator trigger, causing you to pay {4} to exile Digsite Conservator from the top of your library and cast it without paying its mana cost.
  7. Repeat.

Combo 2 with Narcomoeba + Undercity Informer

Results: Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers · Infinite self-mill
Show 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 3 with Narcomoeba + 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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