How can you create a combo with Halo Fountain, Vizier of Tumbling Sands, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Halo Fountain, Vizier of Tumbling Sands, Phyrexian Altar

Color identity: WU
Mana cost: {W}
Steps:
  1. Activate Vizier of Tumbling Sands by tapping it, targeting Halo Fountain.
  2. Holding priority, activate Halo Fountain's first ability by paying {W}, tapping it and untapping Vizier of Tumbling Sands, creating a 1/1 Citizen creature token.
  3. Resolve the Vizier of Tumbling Sands ability, untapping Halo Fountain.
  4. Activate Phyrexian Altar by sacrificing the Citizen token, adding {W}.
  5. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Vizier of Tumbling Sands does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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