How can you create a combo with Adarkar Valkyrie, Hyrax Tower Scout, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Adarkar Valkyrie, Hyrax Tower Scout, Phyrexian Altar

Color identity: GW
Mana cost: {2}{G}
Steps:
  1. Cast Hyrax Tower Scout with its enter the battlefield trigger targeting Adarkar Valkyrie.
  2. Maintaing priority, anctivate Adarkar Valkyrie's ability targeting Hyrax Tower Scout.
  3. Adarkar Valkyrie's ability resolves and Hyrax Tower Scout's trigger resolves untapping Adarkar Valkyrie.
  4. Sacrifice Hyrax Tower Scout to Phyrexian Altar.
  5. Adarkar Valkyrie's ability triggers and returns Hyrax Tower Scout to the battlefield.
  6. Repeat.[END OF COMBO STEPS]

Result:
  - 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:
  - Adarkar Valkyrie must be on the battlefield
  - Hyrax Tower Scout must be in your hand
  - Phyrexian Altar must be on the battlefield
[END OF COMBO PREREQUISITES]
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