the front side of Efficient Construction
the back of a classic MtG card
the front side of Myr Retriever
the back of a classic MtG card
the front side of Scrap Trawler
the back of a classic MtG card
the front side of Krark-Clan Ironworks
the back of a classic MtG card

Color Identity: U

Initial Card State

  1.  Myr Retriever in your graveyard.
  2.  All other permanents on the battlefield.

Steps

  1. Activate Krark-Clan Ironworks by sacrificing Scrap Trawler, adding one colorless manaone colorless mana.
  2. When Scrap Trawler dies, it triggers, returning Myr Retriever from your graveyard to your hand.
  3. Cast Myr Retriever by paying two generic mana.
  4. Efficient Construction triggers, creating a 1/1 Thopter artifact creature token.
  5. Activate Krark-Clan Ironworks twice by sacrificing the Thopter and Myr Retriever, adding one colorless manaone colorless manaone colorless manaone colorless mana.
  6. When Myr Retriever dies, it triggers, returning Scrap Trawler from your graveyard to your hand.
  7. Cast Scrap Trawler by paying three generic mana.
  8. Efficient Construction triggers, creating a 1/1 Thopter artifact creature token.
  9. Repeat.

Results

  1. Infinite artifact ETB.
  2. Infinite colorless mana.
  3. Infinite creature tokens.
  4. Infinite death triggers.
  5. Infinite creature ETB.
  6. Infinite creature LTB.
  7. Infinite creature sacrifice triggers.
  8. Infinite storm count.
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