Altar of Dementia + Cathodion Combos

6 known combos featuring both cards in Commander

Near-infinite death triggers Near-infinite ETB Near-infinite LTB Near-infinite sacrifice triggers Near-infinite storm count

Combo 1 with Underworld Breach

Also requires: Underworld Breach Underworld Breach
Results: Infinite self-mill · Near-infinite death triggers · Near-infinite ETB · Near-infinite LTB · Near-infinite sacrifice triggers · Near-infinite storm count
Steps
  1. Activate Altar of Dementia by sacrificing Cathodion.
  2. Cathodion triggers, adding {C}{C}{C}.
  3. Resolve the Altar of Dementia ability, causing yourself to mill cards equal to Cathodion's power.
  4. Cast Cathodion from your graveyard for its escape cost by paying {3} and exiling three cards from your graveyard.
  5. Repeat.

Combo 2 with Glissa, the Traitor + Grave Pact

Results: Near-infinite death triggers · Near-infinite ETB · Near-infinite LTB · Near-infinite mill · Near-infinite sacrifice triggers · Near-infinite self-mill · Near-infinite storm count · Opponents sacrifice all their creatures each turn · Lock
Show steps
  1. Sacrifice Cathodion to Altar of Dementia.
  2. Cathodion and Grave Pact trigger.
  3. Resolve Cathodion's trigger, adding {C}{C}{C}.
  4. Resolve Grave Pact's trigger, causing each opponent to sacrifice a creature.
  5. Glissa triggers at least once, allowing you to return Cathodion to your hand.
  6. Resolve Altar of Dementia's ability, causing target player to mill cards equal to the sacrificed creature's power.
  7. Cast Cathodion by paying {3}.
  8. Repeat until your opponents no longer control any creatures.

Combo 3 with Glissa, the Traitor + Dictate of Erebos

Results: Near-infinite death triggers · Near-infinite ETB · Near-infinite LTB · Near-infinite mill · Near-infinite sacrifice triggers · Near-infinite self-mill · Near-infinite storm count · Opponents sacrifice all their creatures each turn · Lock
Show steps
  1. Sacrifice Cathodion to Altar of Dementia.
  2. Cathodion and Dictate of Erebos trigger.
  3. Resolve Cathodion's trigger, adding {C}{C}{C}.
  4. Resolve Dictate of Erebos's trigger, causing each opponent to sacrifice a creature.
  5. Glissa triggers at least once, allowing you to return Cathodion to your hand.
  6. Resolve Altar of Dementia's ability, causing target player to mill cards equal to the sacrificed creature's power.
  7. Cast Cathodion by paying {3}.
  8. Repeat until your opponents no longer control any creatures.

Combo 4 with Prototype Portal + Dross Scorpion

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite mill · Infinite self-mill
Show steps
  1. Activate Prototype Portal by paying {3} and tapping it, creating a token copy of Cathodion.
  2. Activate Altar of Dementia by sacrificing Cathodion.
  3. When Cathodion dies, Cathodion and Dross Scorpion trigger.
  4. Resolve the Cathodion trigger, adding {C}{C}{C}.
  5. Resolve the Dross Scorpion trigger, untapping Prototype Portal.
  6. Resolve the Altar of Dementia ability, milling target player a number of cards equal to the sacrificed creature's power.
  7. Repeat.

Combo 5 with Mortuary + Experimental Frenzy

Results: Infinite death triggers · Infinite ETB · Infinite LTB · Infinite mill · Infinite sacrifice triggers · Infinite storm count
Show steps
  1. Activate Altar of Dementia by sacrificing Cathodion.
  2. When Cathodion dies, it and Mortuary trigger.
  3. Resolve the Cathodion trigger, adding {C}{C}{C}.
  4. Resolve the Mortuary trigger, putting Cathodion on top of your library from your graveyard.
  5. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Cathodion's power.
  6. Cast Cathodion from the top of your library by paying {3}.
  7. Repeat.

Combo 6 with Glissa, the Traitor + Butcher of Malakir

Results: Near-infinite death triggers · Near-infinite ETB · Near-infinite LTB · Near-infinite mill · Near-infinite sacrifice triggers · Near-infinite self-mill · Near-infinite storm count · Opponents sacrifice all their creatures each turn · Lock
Show steps
  1. Sacrifice Cathodion to Altar of Dementia.
  2. Cathodion and Butcher of Malakir trigger.
  3. Resolve Cathodion's trigger, adding {C}{C}{C}.
  4. Resolve Butcher of Malakir's trigger, causing each opponent to sacrifice a creature.
  5. Glissa triggers at least once, allowing you to return Cathodion to your hand.
  6. Resolve Altar of Dementia's ability, causing target player to mill cards equal to the sacrificed creature's power.
  7. Cast Cathodion by paying {3}.
  8. Repeat until your opponents no longer control any creatures.
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