the front side of Halo Fountain
the back of a classic MtG card
the front side of Phyrexian Altar
the back of a classic MtG card
the front side of Karn, the Great Creator
the back of a classic MtG card

Color Identity: W

Initial Card State

  1.  All permanents on the battlefield.

Notable Prerequisites

  1. Halo Fountain does not have summoning sickness.

Mana Needed

  1. one white mana available.

Steps

  1. Activate Karn's first loyalty ability by putting a loyalty counter on it, causing Halo Fountain to become an artifact creature until end of turn.
  2. Activate Halo Fountain's first ability by paying one white mana, tapping it and untapping it, creating a 1/1 Citizen creature token.
  3. Activate Phyrexian Altar by sacrificing the Citizen, adding one white mana.
  4. Repeat from step 2.

Results

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