the front side of Professor Onyx
the back of a classic MtG card
the front side of Chain of Smog
the back of a classic MtG card

Color Identity: B

Initial Card State

  1.  Chain of Smog in hand.
  2.  Professor Onyx on the battlefield.

Mana Needed

  1. ({1} magic symbol)  ({B} magic symbol)   available.

Steps

  1. Cast Chain of Smog by paying ({1} magic symbol)  ({B} magic symbol)  , 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.

Results

  1. Infinite lifegain.
  2. Infinite lifegain triggers.
  3. Infinite lifeloss.
  4. Infinite magecraft triggers.

Metadata

  1. In 18338 decks according to EDHREC.
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