the front side of Mairsil, the Pretender
the back of a classic MtG card
the front side of Endling
the back of a classic MtG card
the front side of Blood Vassal
the back of a classic MtG card
the front side of Walking Ballista
the back of a classic MtG card

Color Identity: U, B, R

Initial Card State

  1.  Mairsil on the battlefield.
  2.  All other permanents in exile.

Mana Needed

  1. one black mana available.

Steps

  1. Activate Mairsil using Endling's third ability by paying one black mana, gaining Mairsil undying.
  2. Activate Mairsil using Blood Vassal's ability by sacrificing it, adding one black manaone black mana.
  3. Mairsil undying triggers, returning it to the battlefield with a +1/+1 counter.
  4. Activate Mairsil using Walking Ballista's last ability by removing a +1/+1 counter, dealing 1 damage to any target.
  5. Repeat.

Results

  1. Infinite black mana.
  2. Infinite damage.
  3. Infinite death triggers.
  4. Infinite creature ETB.
  5. Infinite creature LTB.
  6. Infinite creature sacrifice triggers.
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