Mana Echoes + Marath, Will of the Wild + Phyrexian Altar

Mana needed: {R}{G}{W} plus enough mana to pay for commander tax, if applicable

RGW identity

Commander legal

The 3 combo pieces

How to execute it

  1. Cast Marath from the command zone by paying {R}{G}{W} and commander tax, if applicable, causing it to enter the battlefield with a number of +1/+1 counters on it equal to the amount of mana spent to cast it.
  2. When Marath enters the battlefield, Mana Echoes triggers, adding {C} for each Elemental and Beast on the battlefield.
  3. Activate Marath by paying {1} and removing a +1/+1 counter from it, creating a 1/1 Elemental creature token.
  4. When the Elemental enters the battlefield, Mana Echoes triggers, adding {C} for each Elemental on the battlefield.
  5. Repeat from step 3 until Marath has one +1/+1 counter on it.
  6. Activate Marath by paying {1} and removing a +1/+1 counter from it.
  7. Marath dies as a state-based action due to having zero toughness.
  8. Choose to return Marath to the command zone from your graveyard.
  9. Resolve the Marath ability, creating a 1/1 Elemental creature token.
  10. When the Elemental enters the battlefield, Mana Echoes triggers, adding {C} for each Elemental on the battlefield.
  11. Activate Phyrexian Altar by sacrificing three Elementals, adding {R}{G}{W}.
  12. Repeat.
  13. Once you have infinite colorless mana and Elemental tokens, you may cast Marath, causing it to enter with an arbitrarily large number of +1/+1 counters, and choose Marath's other modes instead.

What the combo produces