How can you create a combo with Professor Onyx, Chain of Smog?
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[START OF COMBO]This combo can be formed with Professor Onyx, Chain of Smog

Color identity: B
Mana cost: {1}{B}
Steps:
  1. Cast Chain of Smog by paying {1}{B}, targeting yourself.
  2. Professor Onyx triggers, causing each opponent to lose 2 life and you to gain 2 life.
  3. Resolve Chain of Smog, discarding two cards if possible, then copying the spell without choosing a new target.
  4. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Infinite lifegain
  - Infinite lifegain triggers
  - Infinite lifeloss
  - Infinite magecraft triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Professor Onyx must be on the battlefield
  - Chain of Smog must be in your hand
[END OF COMBO PREREQUISITES]
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