Cast Vulshok Battlemaster by paying {4}{R}.
When Vulshok Battlemaster enters the battlefield, it triggers, causing you to attach all noncreature permanents to Vulshok Battlemaster.
Cast Fumble by paying {1}{U}, returning Vulshok Battlemaster from the battlefield to your hand, and causing you to gain control of all Equipment attached to it, and attach them to another creature you control.

Gain control of all noncreature permanents

Vulshok Battlemaster

Mycosynth Lattice

Bludgeon Brawl

Fumble

Activate the zero-cost artifact's equip ability by paying {0}, targeting Crackdown Construct.
Crackdown Construct triggers, giving itself +1/+1 until end of turn.
Resolve the equip ability, attaching the artifact to Crackdown Construct.
Repeat.

Infinitely large Crackdown Construct until end of turn

Noncreature Artifact Castable for {0}

Crackdown Construct

Cause a noncreature artifact to enter the battlefield under your control, which will be an Equipment due to Bludgeon Brawl if it isn't an Equipment already.
Barret's first ability triggers, creating a 2/2 Rebel creature token and a Food artifact token, which will be an Equipment due to Bludgeon Brawl.
Repeat step 2.

Infinite ETB

Infinite creature tokens

Draw the game

Infinite card draw

Infinite draw triggers

Infinite Food tokens

Barret, Avalanche Leader

Peregrin Took

Cast Vulshok Battlemaster by paying {4}{R}.
When Vulshok Battlemaster enters the battlefield, it triggers, causing you to attach all noncreature permanents to Vulshok Battlemaster.
Cast Murderous Spoils by paying {5}{B}, destroying Vulshok Battlemaster and causing you to gain control of all Equipment attached to it.

Murderous Spoils

Activate Chrome Mox's equip ability by paying {0}, targeting Cephalid Illusionist.
Cephalid Illusionist triggers, causing you to mill three cards.
Resolve the Chrome Mox ability, attaching it to Cephalid Illusionist.
Repeat.

Infinite self-mill

Cephalid Illusionist

Chrome Mox

Activate Seat of the Synod's equip ability by paying {0}, targeting Cephalid Illusionist.
Cephalid Illusionist triggers, causing you to mill three cards.
Resolve the Seat of the Synod ability, attaching it to Cephalid Illusionist.
Repeat.

Seat of the Synod

Activate Great Furnace's equip ability by paying {0}, targeting Cephalid Illusionist.
Cephalid Illusionist triggers, causing you to mill three cards.
Resolve the Great Furnace ability, attaching it to Cephalid Illusionist.
Repeat.

Great Furnace

Activate Darksteel Citadel's equip ability by paying {0}, targeting Cephalid Illusionist.
Cephalid Illusionist triggers, causing you to mill three cards.
Resolve the Darksteel Citadel ability, attaching it to Cephalid Illusionist.
Repeat.

Darksteel Citadel

Cause a noncreature artifact to enter the battlefield under your control, which will be an Equipment due to Bludgeon Brawl if it isn't an Equipment already.
Barret's first ability triggers, creating a 2/2 Rebel creature token.
Activate Shilgengar by sacrificing the Rebel, creating a Blood token which will be an Equipment due to Bludgeon Brawl.
Repeat from step 2.

Combos with "Bludgeon Brawl"