Cause a noncreature artifact to enter the battlefield under your control, which will be an Equipment due to Dan Lewis 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 Dan Lewis.
Repeat step 2.

Draw the game

Infinite ETB

Infinite Food tokens

Infinite card draw

Infinite creature tokens

Infinite draw triggers

Barret, Avalanche Leader

Dan Lewis

Peregrin Took

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.

Bludgeon Brawl

Cast Gemcutter Buccaneer by paying {3}{R}. When it enters, Gemcutter Buccaneer triggers, creating a tapped Treasure token that enters as an Equipment.
When the Treasure enters, Barret triggers, creating a 2/2 Rebel creature token which enters as a Pirate due to Maskwood Nexus.
When the Rebel enters, Gemcutter Buccaneer triggers, creating a tapped Treasure token that enters as an Equipment.
Repeat from step 2.

Infinite tapped Treasure tokens

Gemcutter Buccaneer

Maskwood Nexus

Cast Sword of the Meek by paying {2}.
When Sword of the Meek enters, Grinding Station and Barret's first ability trigger.
Resolve the Grinding Station trigger, untapping it.
Holding priority, activate Grinding Station by tapping it and sacrificing Sword of the Meek.
Resolve the Barret trigger, creating a 2/2 Rebel creature token and a 1/1 Frog creature token due to Quina.
When the Frog enters, Sword of the Meek triggers, returning itself from your graveyard to the battlefield attached to the Frog.
Repeat from step 2.

Infinite mill

Infinite self-mill

Sword of the Meek

Grinding Station

Quina, Qu Gourmet

Activate Improvised Arsenal by paying {4}{R}, creating a token copy of it.
Barret triggers, creating a creature token.
When the creature token enters, Mana Echoes triggers, adding {C} for each creature you control that shares a creature type with the creature token.
If needed, activate Stonework Packbeast by paying {2}, adding {R}.
Repeat.

Infinite colored mana

Infinite colorless mana

Infinite creature tokens that are infinitely powerful

Infinitely powerful creatures you control

Improvised Arsenal

Mana Echoes

Stonework Packbeast

Activate Improvised Arsenal by paying {5}, creating a token copy of it.
Barret triggers, creating a creature token.
When the creature token enters, Mana Echoes triggers, adding {C} for each creature you control that shares a creature type with the creature token.
Repeat.

Mycosynth Lattice

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 "Barret, Avalanche Leader"