Altar of Dementia + Primal Vigor Combos

3 known combos featuring both cards in Commander

Infinite ETB Infinite LTB Infinite death triggers Infinite sacrifice triggers Infinite mill

Combo 1 with Eternal Scourge + Young Deathclaws + Crystalline Crawler

Results: Infinite ETB · Infinite LTB · Infinite death triggers · Infinite mill · Infinite sacrifice triggers · Infinite self-mill · Infinite storm count
Steps
  1. Activate Eternal Scourge's scavenge ability, granted to it by Young Deathclaws, by paying {3} and exiling Eternal Scourge from your graveyard, putting six +1/+1 counters on Crystalline Crawler due to Primal Vigor.
  2. Activate Crystalline Crawler six times by removing six +1/+1 counters from it, adding {6}.
  3. Cast Eternal Scourge from exile by paying {3}.
  4. Activate Altar of Dementia by sacrificing Eternal Scourge.
  5. Repeat.

Combo 2 with Toph, Greatest Earthbender + Power Depot + Crystalline Crawler

Results: Infinite +1/+1 counters on creatures you control · Infinite ETB · Infinite LTB · Infinite colored mana · Infinite death triggers · Infinite landfall triggers · Infinite mill · Infinite sacrifice triggers · Infinite self-mill
Show steps
  1. Play Power Depot, which will enter with a +1/+1 counter on it due to its modular ability
  2. Cast Toph either from your hand or from the command zone by paying {2}{R}{G} plus commander tax if applicable.
  3. When Toph enters, it triggers, earthbending Power Depot and putting a number of +1/+1 counters on Power Depot equal to the mana spent to cast Toph, increased by Primal Vigor.
  4. Activate Altar of Dementia by sacrificing Power Depot.
  5. When Power Depot dies, its modular ability and Toph trigger.
  6. Resolve the modular trigger, putting the +1/+1 counters that were on Power Depot onto Crystalline Crawler, increased by Primal Vigor.
  7. Resolve the Toph trigger, returning Power Depot from your graveyard to the battlefield tapped. Power Depot will enter with a +1/+1 counter on it due to its modular ability
  8. Resolve the Altar of Dementia ability.
  9. Activate Altar of Dementia by sacrificing Toph. Choose to return Toph from your graveyard to the command zone.
  10. Activate Crystalline Crawler by removing a +1/+1 counter from it, adding {R/G}.
  11. Repeat step 10 until you have enough mana to cast Toph.
  12. Repeat from step 2.

Combo 3 with Prosper, Tome-Bound + Goldspan Dragon + Flameskull

Results: Infinite LTB · Infinite ETB · Infinite colored mana · Infinite sacrifice triggers · Infinite death triggers · Infinite storm count · Exile your library · Infinite Treasure tokens
Show steps
  1. Activate Altar of Dementia by sacrificing Flameskull.
  2. When Flameskull dies, it triggers, exiling it and the top card of your library with the ability to cast one from exile this turn.
  3. Resolve the Altar of Dementia ability.
  4. Cast Flameskull from exile by paying {1}{R}{R}.
  5. Prosper's second ability triggers, creating two Treasure tokens.
  6. Activate the Treasures by tapping and sacrificing them, adding {2}{R}{R}.
  7. Repeat.
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