How can you create a combo with Kenrith, the Returned King, Dockside Extortionist, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Kenrith, the Returned King, Dockside Extortionist, Phyrexian Altar

Color identity: WUBRG
Mana cost: {1}{R}
Steps:
  1. Cast Dockside Extortionist.
  2. Dockside Extortionist enters, triggering to create five Treasure tokens.
  3. Sacrifice Dockside Extortionist to Phyrexian Altar, adding one mana of any color.
  4. Activate Kenrith's last ability, returning Dockside Extortionist from your graveyard to the battlefield.
  5. Sacrifice four Treasures for {3}{B}.
  6. Repeat steps 2 to 5.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers
  - Infinite Treasure tokens[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Kenrith, the Returned King must be on the battlefield
  - Dockside Extortionist must be in your hand
  - Phyrexian Altar must be on the battlefield
  - Your opponents control five or more artifacts and/or enchantments.
[END OF COMBO PREREQUISITES]
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