How can you create a combo with Marath, Will of the Wild, Mana Echoes, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Marath, Will of the Wild, Mana Echoes, Phyrexian Altar

Color identity: RGW
Mana cost: {R}{G}{W} plus enough mana to pay for commander tax, if applicable
Steps:
  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.[END OF COMBO STEPS]

Result:
  - Infinite +1/+1 counters
  - Infinite colored mana
  - Infinite colorless mana
  - Infinite commander casts
  - Infinite creature tokens
  - Infinite damage
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Marath, Will of the Wild must be in the command zone
  - Mana Echoes must be on the battlefield
  - Phyrexian Altar must be on the battlefield
[END OF COMBO PREREQUISITES]
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