the front side of Workhorse
the back of a classic MtG card
the front side of Mikaeus, the Unhallowed
the back of a classic MtG card
the front side of Phyrexian Altar
the back of a classic MtG card

Color Identity: B

Initial Card State

  1.  All permanents on the battlefield.

Steps

  1. Activate Workhorse by removing all +1/+1 counters, adding that many ({C} magic symbol)  .
  2. Activate Phyrexian Altar by sacrificing Workhorse, adding one mana of any color.
  3. Workhorse undying ability triggers, returning it to the battlefield with an additional +1/+1 counter on it.
  4. Repeat.

Results

  1. Infinite colored mana.
  2. Infinite colorless mana.
  3. Infinite death triggers.
  4. Infinite ETB.
  5. Infinite LTB.
  6. Infinite sacrifice triggers.

Metadata

  1. In 173 decks according to EDHREC.
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