At the beginning of combat, Captain Rex Nebula triggers, making Brazen Dwarf a Vehicle and giving it Crew 2 and "Whenever this Vehicle deals damage, roll a six-sided die and sacrifice this Vehicle if the result is equal to its mana value" until end of turn.
Activate Brazen Dwarf's Crew ability by tapping Captain Rex Nebula, making it a creature until end of turn.
Activate Assault Suit's equip ability by paying {3}, attaching it to Brazen Dwarf.
Declare Brazen Dwarf as an attacker and deal combat damage with it.
Brazen Dwarf's ability from Captain Rex Nebula triggers, causing you to roll a six-sided die and fail to sacrifice Brazen Dawrf regardless of the result due to Assault Suit's ability.
Brazen Dwarf triggers from the die roll, dealing 1 damage to each opponent.
Repeat from step 5.

Infinite damage

Infinite die rolls

Captain Rex Nebula

Brazen Dwarf

Assault Suit

Leonin Shikari

Cast Exchange of Words by paying {1}{U}{U}.
Exchange of Words enters the battlefield, exchanging the text boxes of Brazen Dwarf and the creature with mana value 0 or mana value greater than 6.
At the beginning of combat, Captain Rex Nebula triggers, making the creature that now has Brazen Dwarf's text box a Vehicle and giving it crew 2 and "Whenever this Vehicle deals damage, roll a six-sided die and sacrifice this Vehicle if the result is equal to its mana value" until end of turn.
Activate the Vehicle's crew ability by tapping Captain Rex Nebula, making it a creature until end of turn.
Declare the Vehicle as an attacker and deal combat damage with it.
The Vehicle's ability from Captain Rex Nebula triggers, rolling a six-sided die with no chance of a result equal to the Vehicle's mana value.
The Vehicle's ability from Brazen Dwarf triggers, dealing 1 damage to each opponent.
Repeat from step 6.

Exchange of Words

At the beginning of combat, Captain Rex Nebula triggers, making the Archipelagore mutated creature a Vehicle and giving it Crew 2 and "Whenever this Vehicle deals damage, roll a six-sided die and sacrifice this Vehicle if the result is equal to its mana value" until end of turn.
Activate this Vehicle's Crew ability by tapping Captain Rex Nebula, making it a creature until end of turn.
Declare the Vehicle as an attacker and deal combat damage with it.
The Vehicle's ability from Captain Rex Nebula triggers, rolling a six-sided die with no chance of a result equal to the Vehicle's mana value of 7.
The Vehicle's ability from Brazen Dwarf triggers, dealing 1 damage to each opponent.
Repeat from step 4.

Archipelagore

Activate Emiel by paying {3} to exile Swarming Goblins and return it to the battlefield.
Swarming Goblins enters the battlefield, rolling a die and creating at least one 1/1 Goblin creature token.
Brazen Dwarf triggers, dealing 1 damage to each opponent.
Malcolm triggers, creating at least three Treasure tokens.
Activate three Treasure tokens by tapping and sacrificing them to add {3}.
Repeat.

Combos with "Brazen Dwarf"