How can you create a combo with Sydri, Galvanic Genius, Halo Fountain, Chromatic Orrery?
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[START OF COMBO]This combo can be formed with Sydri, Galvanic Genius, Halo Fountain, Chromatic Orrery

Color identity: WUB
Mana cost: {U}{U}
Steps:
  1. Activate Sydri's first ability by paying {U}, causing Halo Foutain to become a creature.
  2. Activate Sydri's first ability by paying {U}, causing Chromatic Orrery to become a creature.
  3. Activate Chromatic Orrery's first ability by tapping it, adding {C}{C}{C}{C}{C}.
  4. Activate Halo Fountain's second ability by paying {W}{W} and tap, untapping Chromatic Orrery and itself.
  5. Repeat from step 3.[END OF COMBO STEPS]

Result:
  - Infinite card draw
  - Infinite colored mana
  - Infinite colorless mana[END OF COMBO RESULT][END OF COMBO]

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