How can you create a combo with Omarthis, Ghostfire Initiate, Echoes of Eternity, Mirror Gallery?
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[START OF COMBO]This combo can be formed with Omarthis, Ghostfire Initiate, Echoes of Eternity, Mirror Gallery

Color identity: C
Mana cost: {2} plus enough mana to pay for commander tax, if applicable
Steps:
  1. Cast Omarthis either from your hand or from the command zone by paying {2} plus commander tax, if applicable.
  2. Echoes of Eternity triggers, copying the Omarthis spell.
  3. Resolve the copy of the Omarthis spell, creating a token copy of Omarthis with one +1/+1 counter on it.
  4. Resolve the original Omarthis spell, causing it to enter the battlefield with one +1/+1 counter on it.
  5. The token Omarthis's first ability triggers twice.
  6. Resolve the first trigger, putting a +1/+1 counter on the token Omarthis.
  7. The nontoken Omarthis's first ability triggers twice.
  8. Resolve the first trigger, putting a +1/+1 counter on the nontoken Omarthis.
  9. Repeat from step 5.[END OF COMBO STEPS]

Result:
  - Infinite +1/+1 counters on a creature token
  - Infinite +1/+1 counters on Omarthis[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Omarthis, Ghostfire Initiate must be in your hand or in the command zone
  - Echoes of Eternity must be on the battlefield
  - Mirror Gallery must be on the battlefield
[END OF COMBO PREREQUISITES]
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