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 Junk Diver
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 Junk Diver, adding ({C} magic symbol)  ({C} magic symbol)  .
  2. When Junk Diver dies, it triggers, returning Myr Retriever from your graveyard to your hand.
  3. Cast Myr Retriever by paying ({2} magic symbol)  .
  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 ({C} magic symbol)  ({C} magic symbol)  ({C} magic symbol)  ({C} magic symbol)  .
  6. When Myr Retriever dies, it triggers, returning Junk Diver from your graveyard to your hand.
  7. Cast Junk Diver by paying ({3} magic symbol)  .
  8. Efficient Construction triggers, creating a 1/1 Thopter artifact creature token.
  9. Repeat.

Results

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

Metadata

  1. In 848 decks according to EDHREC.
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