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

Color identity: WU
Mana cost: {1}
Steps:
  1. Activate Karn by paying {1}, causing Halo Fountain to become an artifact creature until end of turn.
  2. Activate Vedalken Engineer by tapping it, adding {W}{W} that can only be spent to cast artifact spells or activate abilities of artifacts.
  3. Activate Halo Fountain's second ability by paying {W}{W}, tapping it and untapping Halo Fountain and Vedalken Engineer, causing you to draw a card.
  4. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Infinite card draw
  - Infinite draw triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Vedalken Engineer and Halo Fountain do not have summoning sickness.
[END OF COMBO PREREQUISITES]
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