How can you create a combo with Captain Rex Nebula, Brazen Dwarf, Exchange of Words?
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[START OF COMBO]This combo can be formed with Captain Rex Nebula, Brazen Dwarf, Exchange of Words

Color identity: URW
Mana cost: {1}{U}{U}
Steps:
  1. Cast Exchange of Words by paying {1}{U}{U}.
  2. 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.
  3. 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.
  4. Activate the Vehicle's crew ability by tapping Captain Rex Nebula, making it a creature until end of turn.
  5. Declare the Vehicle as an attacker and deal combat damage with it.
  6. 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.
  7. The Vehicle's ability from Brazen Dwarf triggers, dealing 1 damage to each opponent.
  8. Repeat from step 6.[END OF COMBO STEPS]

Result:
  - Infinite damage
  - Infinite die rolls[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Captain Rex Nebula must be on the battlefield
  - Brazen Dwarf must be on the battlefield
  - Exchange of Words must be in your hand
  - You control an additional creature with mana value 0 or mana value greater than 6.
  - That additional creature does not have summoning sickness.
  - An opponent cannot block and kill that additional creature.
[END OF COMBO PREREQUISITES]
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