Cast Myr Retriever from your graveyard for its retrace cost by paying {2} and discarding the artifact land card.
Activate Ashnod's Altar by sacrificing Myr Retriever, adding {C}{C}.
When Myr Retriever dies, it triggers, returning the artifact land card from your graveyard to your hand.
Repeat.

Infinite creature LTB

Infinite creature ETB

Infinite creature sacrifice triggers

Infinite death triggers

Infinite storm count

Infinite self-discard triggers

Artifact Land

Myr Retriever

Ashnod's Altar

Cast Myr Retriever from your graveyard for its retrace cost by paying {2} and discarding the artifact land card.
Activate Krark-Clan Ironworks by sacrificing Myr Retriever, adding {C}{C}.
When Myr Retriever dies, it triggers, returning the artifact land card from your graveyard to your hand.
Repeat.

Krark-Clan Ironworks

Activate Salvaging Station by tapping it returning the artifact land from your graveyard to the battlefield.
The artifact land enters the battlefield as a creature due to March of the Machines, and dies as a state-based action due to having 0 toughness.
Salvaging Station triggers, untapping itself.
Repeat.

Infinite landfall triggers

March of the Machines

Salvaging Station

Cast Chromatic Sphere from your graveyard by paying {0} and discarding an artifact land card from your hand.
Activate Chromatic Sphere by paying {1}, tapping and sacrificing it, adding {1} and causing you to draw a card.
Scrap Trawler triggers, returning an artifact land card from your graveyard to your hand.
Repeat.

Infinite card draw

Infinite draw triggers

Near-infinite storm count

Near-infinite self-discard triggers

Scrap Trawler

Chromatic Sphere

Foundry Inspector

Activate Prototype Portal by paying {0} and tapping it, creating a token copy of the artifact land.
The artifact land token enters the battlefield as a 0/0 artifact creature due to March of the Machines, and dies as a state-based action due to having zero or less toughness.
Dross Scorpion triggers, untapping Prototype Portal.
Repeat.

Prototype Portal

Dross Scorpion

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