Activate Krark-Clan Ironworks by sacrificing Scrap Trawler, adding {C}{C}.
When Scrap Trawler dies, it triggers, returning Myr Retriever from your graveyard to your hand.
Cast Myr Retriever by paying {2}.
Efficient Construction triggers, creating a 1/1 Thopter artifact creature token.
Activate Krark-Clan Ironworks twice by sacrificing the Thopter and Myr Retriever, adding {C}{C}{C}{C}.
When Myr Retriever dies, it triggers, returning Scrap Trawler from your graveyard to your hand.
Cast Scrap Trawler by paying {3}.
Efficient Construction triggers, creating a 1/1 Thopter artifact creature token.
Repeat.

Infinite colorless mana

Infinite creature tokens

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite sacrifice triggers

Infinite storm count

Efficient Construction

Myr Retriever

Scrap Trawler

Krark-Clan Ironworks

Activate Ashnod's Altar by sacrificing Scrap Trawler, adding {C}{C}.
When Scrap Trawler dies, it triggers, returning Myr Retriever from your graveyard to your hand.
Cast Myr Retriever by paying {2}.
Efficient Construction triggers, creating a 1/1 Thopter artifact creature token.
Activate Ashnod's Altar twice by sacrificing the Thopter and Myr Retriever, adding {C}{C}{C}{C}.
When Myr Retriever dies, it triggers, returning Scrap Trawler from your graveyard to your hand.
Cast Scrap Trawler by paying {3}.
Efficient Construction triggers, creating a 1/1 Thopter artifact creature token.
Repeat.

Ashnod's Altar

Activate Krark-Clan Ironworks by sacrificing Junk Diver, adding {C}{C}.
When Junk Diver dies, it triggers, returning Myr Retriever from your graveyard to your hand.
Cast Myr Retriever by paying {2}.
Efficient Construction triggers, creating a 1/1 Thopter artifact creature token.
Activate Krark-Clan Ironworks twice by sacrificing the Thopter and Myr Retriever, adding {C}{C}{C}{C}.
When Myr Retriever dies, it triggers, returning Junk Diver from your graveyard to your hand.
Cast Junk Diver by paying {3}.
Efficient Construction triggers, creating a 1/1 Thopter artifact creature token.
Repeat.

Junk Diver

Activate Ashnod's Altar by sacrificing Junk Diver, adding {C}{C}.
When Junk Diver dies, it triggers, returning Myr Retriever from your graveyard to your hand.
Cast Myr Retriever by paying {2}.
Efficient Construction triggers, creating a 1/1 Thopter artifact creature token.
Activate Ashnod's Altar twice by sacrificing the Thopter and Myr Retriever, adding {C}{C}{C}{C}.
When Myr Retriever dies, it triggers, returning Junk Diver from your graveyard to your hand.
Cast Junk Diver by paying {3}.
Efficient Construction triggers, creating a 1/1 Thopter artifact creature token.
Repeat.

Cast Sensei's Divining Top by paying {1}.
Efficient Construction and Forensic Gadgeteer trigger, creating a 1/1 Thopter artifact creature token and a Clue token.
Activate Krark-Clan Ironworks by sacrificing the Thopter, adding {C}{C}.
Activate Sensei's Divining Top by tapping it, causing you to draw a card and put Sensei's Divining Top from the battlefield onto the top of your library.
Activate the Clue by paying {1} and sacrificing it, causing you to draw Sensei's Divining Top.
Repeat.

Infinite card draw

Near-infinite ETB

Infinite draw triggers

Near-infinite storm count

Near-infinite LTB

Near-infinite death triggers

Near-infinite sacrifice triggers

Forensic Gadgeteer

Sensei's Divining Top

Activate Lotus Petal by tapping and sacrificing it, adding one mana of any color.
Activate Emry by tapping it, targeting Lotus Petal.
Cast Lotus Petal from your graveyard by paying {0}.
Chakram Retriever and Efficient Construction both trigger.
Resolve the Chakram Retriever trigger, untapping Emry.
Resolve the Efficient Construction trigger, creating a 1/1 Thopter token.
Lotus Petal resolves.
Repeat.

Infinite colored mana

Emry, Lurker of the Loch

Chakram Retriever

Lotus Petal

Activate Empowered Autogenerator's first ability by tapping it, putting a charge counter on it and adding at least {4}.
Cast Ancestral Statue by paying {4}.
Efficient Construction triggers, creating a 1/1 Thopter artifact creature token.
Ancestral Statue enters the battlefield, triggering itself.
Holding priority, activate Clock of Omens by tapping the Thopter and Ancestral Statue, untapping Empowered Autogenerator.
Resolve the Ancestral Statue trigger, returning it from the battlefield to your hand.
Repeat.

Infinite charge counters on Empowered Autogenerator

Infinite tapped creature tokens

Ancestral Statue

Clock of Omens

Empowered Autogenerator

Cast Shrieking Drake by paying {U}.
Efficient Construction triggers, creating a 1/1 Thopter artifact creature token.
Activate Phyrexian Altar by sacrificing a Thopter, adding {U}.
Shrieking Drake enters the battlefield, returning itself to its owner's hand.
Repeat.

Encroaching Mycosynth

Phyrexian Altar

Shrieking Drake

Activate Slobad by tapping it and sacrificing Spine of Ish Sah, adding seven {R} that can only be spent to cast artifact spells or to activate abilities of artifacts.
Spine of Ish Sah leaves the battlefield, returning itself from your graveyard to your hand.
Cast Spine of Ish Sah by paying {7}.
Efficient Construction triggers, creating a 1/1 Thopter artifact creature token.
The Thopter enters the battlefield, triggering Intruder Alarm, untapping all creatures.
Spine of Ish Sah enters the battlefield, destroying target permanent.
Repeat.

Destroy any number of permanents on each of your turns

Infinite mana creatures you control can produce

Infinite untap of all creatures

Slobad, Iron Goblin

Spine of Ish Sah

Intruder Alarm

Cast Glint Hawk by paying {W}.
Efficient Construction triggers, creating a 1/1 Thopter artifact creature token.
Activate Phyrexian Altar by sacrificing a Thopter, adding {W}.
Glint Hawk enters the battlefield, returning itself to your hand.
Repeat.

Glint Hawk

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