How can you create a combo with Vedalken Mastermind, Intruder Alarm, Dual Nature, Phyrexian Altar, Ornithopter?
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[START OF COMBO]This combo can be formed with Vedalken Mastermind, Intruder Alarm, Dual Nature, Phyrexian Altar, Ornithopter

Color identity: GU
Mana cost: 
Steps:
  1. Cast Ornithopter by paying {0}.
  2. When Ornithopter enters the battlefield, Intruder Alarm and Dual Nature's first ability triggers.
  3. Resolve the Intruder Alarm trigger, untapping all creatures.
  4. Resolve the Dual Nature trigger, creating a token copy of Ornithopter.
  5. Activate Phyrexian Altar by sacrificing the Ornithopter token, adding {U}.
  6. Activate Vedalken Mastermind by paying {U} and tapping it, returning Ornithopter to your hand from the battlefield.
  7. Dual Nature's second ability triggers, exiling nothing.
  8. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite mana creatures you control can produce
  - Infinite storm count
  - Infinite untap of all creatures[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Vedalken Mastermind must be on the battlefield
  - Intruder Alarm must be on the battlefield
  - Dual Nature must be on the battlefield
  - Phyrexian Altar must be on the battlefield
  - Ornithopter must be in your hand
  - Vedalken Mastermind does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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