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 artifact ETB

Infinite artifact tokens

Draw the game

Infinite creature ETB

Infinite creature tokens

Infinite tapped Treasure tokens

Barret, Avalanche Leader

Gemcutter Buccaneer

Maskwood Nexus

Cast Gemcutter Buccaneer by pying {3}{R}.
When Gemcutter Buccaneer enters the battlefield, it triggers, creating a tapped Treasure artifact token.
The Treasure enters the battlefield as a 0/0 creature with all creature types due to March of the Machines and Maskwood Nexus, causing it to die as a state-based action due to having 0 toughness.
Gemcutter Buccaneer triggers, creating a Treasure artifact token.
Repeat from step 3.
NOTE: This combo creates a mandatory infinite loop that will draw the game if it isn't interacted with.

Infinite death triggers

Infinite creature LTB

March of the Machines

Cast Gemcutter Buccaneer by paying {3}{R}.
When Gemcutter Buccaneer enters the battlefield, it triggers, creating a tapped 2/2 Cat or 3/1 Dog creature token due to Jinnie Fay.
When the Cat or Dog enters the battlefield as a Pirate due to Maskwood Nexus, Gemcutter Buccaneer triggers, creating a tapped 2/2 Cat or 3/1 Dog creature token due to Jinnie Fay.
Repeat step 3.

Infinite tapped creature tokens

Jinnie Fay, Jetmir's Second

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, Sokka and Suki triggers, creating a 1/1 Ally creature token which enters as a Pirate due to Maskwood Nexus.
When the Ally enters, Gemcutter Buccaneer triggers, creating a tapped Treasure token that enters as an Equipment.
Repeat from step 2.

Sokka and Suki

Activate Sliver Queen by paying {2}, creating a 1/1 Sliver creature token.
When the Sliver enters the battlefield as a Pirate due to Maskwood Nexus, Gemcutter Buccaneer triggers, creating a tapped Treasure token.
Activate Krark-Clan Ironworks by sacrificing the Treasure, adding {C}{C}.
Repeat.

Sliver Queen

Krark-Clan Ironworks

Activate Sliver Queen by paying {2}, creating a 1/1 Sliver creature token.
When the Sliver enters the battlefield as a Pirate due to Arcane Adaptation, Gemcutter Buccaneer triggers, creating a tapped Treasure token.
Activate Krark-Clan Ironworks by sacrificing the Treasure, adding {C}{C}.
Repeat.

Arcane Adaptation

Activate Sliver Queen by paying {2}, creating a 1/1 Sliver creature token.
When the Sliver enters the battlefield as a Pirate due to Xenograft, Gemcutter Buccaneer triggers, creating a tapped Treasure token.
Activate Krark-Clan Ironworks by sacrificing the Treasure, adding {C}{C}.
Repeat.

Xenograft

Activate Sliver Queen by paying {2}, creating a 1/1 Sliver creature token.
When the Sliver enters the battlefield as a Pirate due to Conspiracy, Gemcutter Buccaneer triggers, creating a tapped Treasure token.
Activate Krark-Clan Ironworks by sacrificing the Treasure, adding {C}{C}.
Repeat.

Conspiracy

Activate Sliver Queen by paying {2}, creating a 1/1 Sliver creature token.
When the Sliver enters the battlefield as a Pirate due to Rukarumel, Gemcutter Buccaneer triggers, creating a tapped Treasure token.
Activate Krark-Clan Ironworks by sacrificing the Treasure, adding {C}{C}.
Repeat.

Combos with "Gemcutter Buccaneer"