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Color Identity: Black

Prerequisites

  1. Professor Onyx on the battlefield
  2. Chain of Smog in hand
  3. (1 magic symbol)   (b magic symbol)   available

Steps

  1. Cast Chain of Smog targeting yourself
  2. Professor Onyx triggers, losing each opponent two life and gaining you two life
  3. Resolve Chain of Smog, copying the spell and choosing yourself as the new target
  4. Repeat from step 2

Results

  1. Infinite life loss
  2. Infinite lifegain