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

Color identity: GW
Mana cost: {3}{W}{W}
Steps:
  1. Cast Celestial Gatekeeper by paying {3}{W}{W}.
  2. Celestial Gatekeeper enters the battlefield, triggering Dual Nature's first ability, creating a token copy of Celestial Gatekeeper.
  3. Activate Phyrexian Altar by sacrificing the nontoken Celestial Gatekeeper, adding {1}.
  4. Celestial Gatekeeper dies, triggering itself and Dual Nature's second ability.
  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 Dual Nature's first ability, creating a token copy of Celestial Gatekeeper.
  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 this way, Dual Nature's first ability triggers, creating a token copy of that creature.
  10. Repeat from step 3.
  11. Resolve all triggers from Dual Nature's second ability, exiling all tokens with the same name as a creature card that left the battlefield during this combo.[END OF COMBO STEPS]

Result:
  - Infinite blinking of Bird and Cleric creatures
  - Infinite colored mana
  - 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
  - Dual Nature must be on the battlefield
  - Phyrexian Altar must be on the battlefield
[END OF COMBO PREREQUISITES]
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