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 Pet
the back of a classic MtG card
the front side of Crystalline Crawler
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.

Notable Prerequisites

  1. Mairsil does not have a +1/+1 counter on it.

Mana Needed

  1. one black mana available.

Steps

  1. Activate Mairsil using Endling's third ability by paying one black mana, giving Mairsil undying until end of turn.
  2. Activate Mairsil using Blood Pet's ability by sacrificing it, adding one black mana.
  3. Mairsil dies, triggering its undying ability, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  4. Activate Mairsil using Crystalline Crawler's first ability by removing a +1/+1 counter from it, adding one mana of any color.
  5. Repeat.

Results

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