How can you create a combo with Purphoros, Bronze-Blooded, Firestorm Phoenix, Phyrexian Altar, Mana Echoes?
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[START OF COMBO]This combo can be formed with Purphoros, Bronze-Blooded, Firestorm Phoenix, Phyrexian Altar, Mana Echoes

Color identity: R
Mana cost: {2}{R}
Steps:
  1. Activate Purphoros by paying {2}{R}, putting Firestorm Phoenix onto the battlefield from your hand.
  2. When Firestorm Phoenix enters the battlefield, Mana Echoes triggers, adding at least {C}{C}.
  3. Activate Phyrexian Altar by sacrificing Firestorm Phoenix, adding {R}.
  4. Firestorm Phoenix is returned to your hand instead of being put into your graveyard.
  5. Repeat.
  6. If there are at least two other Phoenixs on the battlefield, this combo will produce infinite colorless mana.[END OF COMBO STEPS]

Result:
  - Infinite colorless mana
  - Infinite enters the battlefield
  - Infinite leaves the battlefield[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Purphoros, Bronze-Blooded must be on the battlefield
  - Firestorm Phoenix must be in your hand
  - Phyrexian Altar must be on the battlefield
  - Mana Echoes must be on the battlefield
  - You control at least one Phoenix.
[END OF COMBO PREREQUISITES]
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