How can you create a combo with Lumra, Bellow of the Woods, Port of Karfell, Tiller Engine, Squandered Resources?
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[START OF COMBO]This combo can be formed with Lumra, Bellow of the Woods, Port of Karfell, Tiller Engine, Squandered Resources

Color identity: BGU
Mana cost: 
Steps:
  1. If desired, activate any number of other mana-producing lands you control by tapping them, adding at least {1} for each land tapped this way.
  2. Activate Squandered Resources by sacrificing a mana-producing land other than Port of Karfell, adding {U} or {B} if possible, or any other type of mana otherwise.
  3. Repeat step 2 until you control no other mana-producing lands except Port of Karfell.
  4. Activate Port of Karfell's second ability by paying {3}{U}{B}{B}, tapping and sacrificing it, causing you to mill four cards and return Lumra from your graveyard to the battlefield tapped.
  5. Lumra enters the battlefield and dies as a state-based action due to having 0 toughness.
  6. Lumra's enter-the-battlefield ability triggers, causing you to mill four cards and return all land cards from your graveyard to the battlefield tapped.
  7. When the lands enter the battlefield, Tiller Engine triggers that many times, untapping the lands.
  8. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite landfall triggers
  - Infinite leaves the battlefield
  - Infinite mana lands you control can produce
  - Infinite sacrifice triggers
  - Infinite self-mill
  - Put all land cards from your library and graveyard onto the battlefield[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Lumra, Bellow of the Woods must be in the graveyard
  - Port of Karfell must be on the battlefield
  - Tiller Engine must be on the battlefield
  - Squandered Resources must be on the battlefield
  - You can produce at least {3}{U}{B}{B} between sacrificing lands excluding Port of Karfell to Squandered Resources and/or by tapping those lands for mana.
[END OF COMBO PREREQUISITES]
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