How can you create a combo with Sigil of the New Dawn, Mana Echoes, Siege-Gang Commander, Energy Refractor?
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[START OF COMBO]This combo can be formed with Sigil of the New Dawn, Mana Echoes, Siege-Gang Commander, Energy Refractor

Color identity: RW
Mana cost: {3}{R}{R}
Steps:
  1. Cast Siege-Gang Commander by paying {3}{R}{R}.
  2. When Siege-Gang Commander enters the battlefield, it and Mana Echoes trigger.
  3. Resolve the Siege-Gang Commander trigger, creating three 1/1 Goblin creature tokens.
  4. When the Goblin tokens enter the battlefield, Mana Echoes triggers three times.
  5. Resolve all four Mana Echoes triggers, adding at least {16}.
  6. Activate Energy Refractor four times by paying {8}, adding {W}{R}{R}{R}.
  7. Activate Siege-Gang Commander by paying {C}{R} and sacrificing itself.
  8. Sigil of the New Dawn triggers, causing you to pay {C}{W} to return Siege-Gang Commander from your graveyard to your hand.
  9. Resolve the Siege-Gang Commander activated ability, dealing 2 damage to any target.
  10. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite colorless mana
  - 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:
  - Sigil of the New Dawn must be on the battlefield
  - Mana Echoes must be on the battlefield
  - Siege-Gang Commander must be in your hand
  - Energy Refractor must be on the battlefield
[END OF COMBO PREREQUISITES]
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