How can you create a combo with Death Match, Dockside Extortionist, Brain Freeze, Underworld Breach?
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[START OF COMBO]This combo can be formed with Death Match, Dockside Extortionist, Brain Freeze, Underworld Breach

Color identity: UBR
Mana cost: {1}{R}
Steps:
  1. If Dockside Extortionist is in your hand, cast it by paying {1}{R}.
  2. Otherwise, cast it from your graveyard for its escape cost by paying {1}{R} and exiling any three cards from your graveyard except Brain Freeze.
  3. Dockside Extortionist enters the battlefield, triggering itself and Death Match.
  4. Resolve the Dockside Extortionist trigger, creating at least five Treasure tokens.
  5. Resolve the Death Match trigger, giving Dockside Extortionist -3/-3 until end of turn.
  6. Dockside Extortionist dies as a state-based action due to having zero or less toughness.
  7. Activate four Treasure tokens by tapping and sacrificing them, adding {2}{U}{R}.
  8. If Brain Freeze is in your hand, cast it by paying {1}{U}.
  9. Otherwise, cast it from your graveyard for its escape cost by paying {1}{R} and exiling any three cards from your graveyard except Dockside Extortionist.
  10. Brain Freeze's storm ability triggers, creating a copy of Brain Freeze for each other spell you've cast this turn.
  11. Resolve the first two Brain Freezes, causing you to mill six cards.
  12. Resolve all remaining Brain Freezes, causing target player to mill three cards for each Brain Freeze.
  13. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite self-mill
  - Near-infinite colored mana
  - Near-infinite death triggers
  - Near-infinite enters the battlefield
  - Near-infinite leaves the battlefield
  - Near-infinite mill
  - Near-infinite storm count
  - Near-infinite Treasure tokens[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Death Match must be on the battlefield
  - Dockside Extortionist must be in your hand or in the graveyard
  - Brain Freeze must be in your hand or in the graveyard
  - Underworld Breach must be on the battlefield
  - If Dockside Extortionist and/or Brain Freeze are in your graveyard, you have an additional three cards in your graveyard for each one.
  - Opponents control at least five artifacts and/or enchantments.
[END OF COMBO PREREQUISITES]
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