How can you create a combo with Halo Fountain, Phyrexian Altar, Karn, Silver Golem?
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[START OF COMBO]This combo can be formed with Halo Fountain, Phyrexian Altar, Karn, Silver Golem

Color identity: W
Mana cost: {1}{W}
Steps:
  1. Activate Karn by paying {1}, causing Halo Fountain to become an artifact creature until end of turn.
  2. Activate Halo Fountain's first ability by paying {W}, tapping it and untapping it, creating a 1/1 Citizen creature token.
  3. Activate Phyrexian Altar by sacrificing the Citizen, adding {W}.
  4. Repeat from step 2.[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
  - Halo Fountain does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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