Cast Myr Retriever by paying {2}.
Myr Retriever enters the battlefield, triggering Mirrorworks.
Holding priority, activate Krark-Clan Ironworks by sacrificing Myr Retriever, adding {C}{C}.
Myr Retriever dies, returning another artifact card from your graveyard to your hand.
Resolve the Mirrorworks trigger from step 2, creating a token copy of Myr Retriever.
Activate Krark-Clan Ironworks by sacrificing the token Myr Retriever, adding {C}{C}.
The token Myr Retriever dies, returning Myr Retriever from your graveyard to your hand.
Repeat.

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite sacrifice triggers

Infinite storm count

Mirrorworks

Myr Retriever

Krark-Clan Ironworks

Cast Myr Retriever.
Mirrorworks triggers.
In response to the trigger, sacrifice Myr Retriever to Ashnod's Altar, adding {C}{C}.
Resolve the Myr Retriever death trigger with no targets.
Pay for Mirrorworks' trigger, creating a token copy of Myr Retriever.
Sacrifice the token copy of Myr Retriever to Ashnod's Altar, adding {C}{C}.
The token copy of Myr Retriever triggers, returning Myr Retriever from your graveyard to your hand.
Repeat.

Ashnod's Altar

Cast Worldwalker Helm by paying {2}{U}.
When Worldwalker Helm enters the battlefield, Mirrorworks triggers, causing you to pay {2} to create a token copy of Worldwalker Helm and a Map token.
Activate Urza's first ability by tapping a Worldwaker Helm and a Map, adding {U}{U}.
Activate a Worldwalker Helm by paying {1}{U} and tapping it, creating a token copy of the Worldwalker Helm token and two Map tokens.
Activate Urza's first ability twice by tapping the Maps, adding {U}{U}.
Repeat from step 4.

Infinite tapped Map tokens

Urza, Lord High Artificer

Worldwalker Helm

Cast Ugin's Nexus by paying {5}.
Ugin's Nexus enters the battlefield, triggering Mirrorworks, causing you to pay {2} to create a copy of Ugin's Nexus.
Exile the token copy of Ugin's Nexus due to the legend rule, causing you to take an extra turn after this one.
Activate Master Transmuter by paying {U}, tapping it, and returning Ugin's Nexus to your hand, choosing not to put an artifact card from your hand onto the battlefield.
Repeat each turn.

Infinite turns

Master Transmuter

Ugin's Nexus

Cast Silver Myr by paying {2}.
Silver Myr enters the battlefield, triggering Mirrorworks, causing you to pay {2} to create a token copy of Silver Myr.
Activate Lightning Greaves' equip ability by paying {0}, attaching it to a Silver Myr.
Activate the Silver Myr by tapping it, adding {U}.
Repeat from step 3 one additional time.
Cast Myr Galvanizer by paying {3}.
Myr Galvanizer enters the battlefield, triggering Mirrorworks, causing you to pay {2} to create a token copy of Myr Galvanizer.
Activate Lightning Greaves' equip ability by paying {0}, attaching it to a Myr Galvanizer.
Activate the Myr Galvanizer by paying {1} and tapping it, untapping all other Myr you control.
Activate Lightning Greaves' equip ability by paying {0}, attaching it to a Silver Myr.
Activate the Silver Myr by tapping it, adding {U}.
Repeat from step 10 one additional time.
Repeat from step 8.

Infinite blue mana

Infinite untap of Myrs you control

Myr Galvanizer

Silver Myr

Lightning Greaves

Cast Silver Myr by paying {2}.
Silver Myr enters the battlefield, triggering Mirrorworks, causing you to pay {2} to create a token copy of Silver Myr.
Activate both Silver Myr by tapping them, adding {U}{U}.
Cast Myr Galvanizer by paying {3}.
Myr Galvanizer enters the battlefield, triggering Mirrorworks, causing you to pay {2} to create a token copy of Myr Galvanizer.
Activate a Myr Galvanizer by paying {1} and tapping it, untapping all other Myr you control.
Activate both Silver Myr by tapping them, adding {U}{U}.
Repeat from step 6.

Thousand-Year Elixir

Activate Chromatic Orrery's first ability by tapping it, adding {5}.
Activate Master Transmuter by paying {1}, tapping it and returning Corridor Monitor to your hand, putting Corridor Monitor from your hand onto the battlefield.
Corridor Monitor enters the battlefield, triggering itself and Mirrorworks.
Resolve the Mirrorworks trigger, causing you to pay {2} to create a token copy of Corridor Monitor.
The Corridor Monitor token enters the battlefield, untapping Master Transmuter.
Activate Master Transmuter by paying {1}, tapping it and returning Chromatic Orrery to your hand, putting Chromatic Orrery from your hand onto the battlefield.
Chromatic Orrery enters the battlefield, triggering Mirrorworks; choose not to pay for the trigger.
Resolve the Corridor Monitor trigger from step 3, untapping Master Transmuter.
Repeat.

Infinite blinking of artifacts you control

Infinite card draw

Infinite colored mana

Infinite colorless mana

Infinite creature tokens

Infinite draw triggers

Corridor Monitor

Chromatic Orrery

Cast Aeon Engine by paying {5}.
Aeon Engine enters the battlefield, triggering Mirrorworks, causing you to pay {2} to create a copy of Aeon Engine.
Activate Master Transmuter by paying {U} and tapping it, returning Aeon Engine to your hand.
Pass the turn.
Untap all permanents you control during each opponent's untap step due to Unwinding Clock.
Activate the token copy of Aeon Engine by tapping and exiling it, reversing the game order.
On your turn, repeat from step 1.

Locks out all of your opponents but one, and allows you to choose which of your two neighboring opponents get to have turns

Aeon Engine

Unwinding Clock

Cast Basalt Monolith by paying {3}.
When Basalt Monolith enters the battlefield, Mirrorworks triggers, causing you to pay {2} to create a token copy of Basalt Monolith.
Activate the token Basalt Monolith's first ability by tapping it, adding {C}{C}{C}.
Roxanne's second ability triggers, adding {C}.
Activate the token Basalt Monolith's second ability by paying {3}, untapping it.
Repeat from step 3.

Roxanne, Starfall Savant

Basalt Monolith

Activate Abuelo by paying {1}{W}{U}, exiling Ugin's Nexus until the beginning of the next end step.
At the beginning of your end step, Abuelo triggers, returning Ugin's Nexus from exile to the battlefield.
When Ugin's Nexus enters the battlefield, Mirrorworks triggers, causing you to pay {2} to create a token copy of Ugin's Nexus.
Put the token Ugin's Nexus into exile due to the legend rule and its replacement effect, causing you to take an extra turn after this one.
Activate Abuelo by paying {1}{W}{U}, exiling Ugin's Nexus until the beginning of the next end step.
Move to your next turn, not skipping it as Ugin's Nexus is not on the battlefield.
Repeat from step 2.

Abuelo, Ancestral Echo

Cast Crop Sigil from your graveyard for its retrace cost by paying {G} and discarding Dryad Arbor.
Cast Lion's Eye Diamond from your graveyard for its retrace cost by discarding another land in your hand.
When Lion's Eye Diamond enters the battlefield, Mirrorworks triggers.
Holding priority, activate Lion's Eye Diamond by sacrificing it and discarding your hand, adding three mana of any color.
Resolve the Mirrorworks trigger, causing you to pay {2} to create a token copy of Lion's Eye Diamond.
Activate the Lion's Eye Diamond token by sacrificing it and discarding your hand, adding {G}{G}{G}.
Activate Crop Sigil by paying {2}{G} and sacrificing it, returning Dryad Arbor and another land card from your graveyard to your hand.
Repeat.

Infinite self-discard triggers

Dryad Arbor

Crop Sigil

Lion's Eye Diamond

Play the permanent from your hand, triggering Kodama of the East Tree on ETB.
With the Kodama of the East Tree trigger on the stack, sacrifice Lotus Bloom for {W}{W}{W} and spend two of it to activate Auriok Salvagers, returning Lotus Bloom to your hand.
Resolve the Kodama of the East Tree trigger, putting Lotus Bloom onto the battlefield.
Pay {2} for the Mirrorworks trigger, creating a token copy of Lotus Bloom.
Kodama of the East Tree triggers.
Before the trigger resolves, sacrifice the token Lotus Bloom copy for {W}{W}{W}.
Repeat.

Combos with "Mirrorworks"