How can you create a combo with Celestial Gatekeeper, Molten Echoes, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Celestial Gatekeeper, Molten Echoes, Phyrexian Altar

Color identity: RW
Mana cost: {3}{W}{W}
Steps:
  1. Cast Celestial Gatekeeper by paying {3}{W}{W}.
  2. Celestial Gatekeeper enters the battlefield, triggering Molten Echoes, creating a token copy of Celestial Gatekeeper with haste.
  3. Activate Phyrexian Altar by sacrificing the nontoken Celestial Gatekeeper, adding {1}.
  4. Celestial Gatekeeper dies, triggering itself.
  5. In response, activate Phyrexian Altar by sacrificing the Celestial Gatekeeper token, adding {1}.
  6. The Celestial Gateekeeper token dies, triggering itself, exiling itself and returning Celestial Gatekeeper from your graveyard to the battlefield.
  7. Celestial Gatekeeper enters the battlefield, triggering Molten Echoes, creating a token copy of Celestial Gatekeeper with haste.
  8. Resolve the nontoken Celestial Gateekeeper's trigger, failing to exile itself and returning up to two more Birds and/or Clerics from your graveyard to the battlefield.
  9. If you returned a creature of the type chosen with Motlen Echoes, it triggers, creating a token copy of that creature with haste.
  10. Repeat from step 3.[END OF COMBO STEPS]

Result:
  - Infinite blinking of Bird or Cleric creatures
  - Infinite colored mana
  - Infinite creature tokens with haste
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Celestial Gatekeeper must be in your hand
  - Molten Echoes must be on the battlefield
  - Phyrexian Altar must be on the battlefield
  - "Bird" or "Cleric" chosen with Motlen Echoes.
[END OF COMBO PREREQUISITES]
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