Horizon Explorer + Need for Speed Combos

3 known combos featuring both cards in Commander

Infinite landfall triggers Infinite ETB Infinite death triggers Infinite mana lands you control can produce Infinite self-mill

Combo 1 with Lumra, Bellow of the Woods + Mirrorpool

Results: Infinite ETB · Infinite death triggers · Infinite self-mill · Infinite mana lands you control can produce · Infinite landfall triggers · Put all land cards from your library and graveyard onto the battlefield
Steps
  1. Activate any number of other lands by tapping them, adding at least {4}{C}.
  2. Activate Need for Speed by sacrificing a land except Mirrorpool.
  3. Repeat step 2 until you control no lands except Mirrorpool.
  4. Activate Mirrorpool's third ability by paying {4}{C}, tapping and sacrificing it, creating a token copy of Lumra.
  5. Put the Lumra token into your graveyard due to the legend rule.
  6. The Lumra token's enters-the-battlefield ability triggers, causing you to mill four cards and return all land cards from your graveyard to the battlefield untapped due to Horizon Explorer.
  7. Repeat.

Combo 2 with Mirrorpool + Splendid Reclamation

Results: Infinite mana lands you control can produce · Infinite magecraft triggers · Infinite landfall triggers
Show steps
  1. Cast Splendid Reclamation by paying {3}{G}.
  2. Holding priority, activate any number of lands you control except Mirrorpool by tapping them, adding at least {2}{C}.
  3. Activate Need for Speed by sacrificing a land other than Mirrorpool.
  4. Repeat step 3 until Mirrorpool is the only land you control.
  5. Activate Mirrorpool's second ability by paying {2}{C}, tapping and sacrificing it, copying Splendid Reclamation.
  6. Resolve the Splendid Reclamation copy, returning all land cards from your graveyard to the battlefield untapped due to Horizon Explorer.
  7. Repeat from step 2.

Combo 3 with Emeria Shepherd + Aftermath Analyst

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite landfall triggers · Return all nonland permanents from your graveyard to the battlefield
Show steps
  1. Activate any number of lands by tapping them, adding at least {3}{G}.
  2. Activate Need for Speed by sacrificing a land.
  3. Repeat step 2 until you control no lands.
  4. Activate Aftermath Analyst by paying {3}{G} and sacrificing it, returning all lands from your graveyard to the battlefield untapped due to Horizon Explorer.
  5. When the lands enter, Emeria Shepherd triggers that many times.
  6. Resolve an Emeria Shepherd trigger that was triggered by a Plains, returning Aftermath Analyst from your graveyard to the battlefield.
  7. Resolve all other Emeria Shepherd triggers, returning any number of nonland permanents from your graveyard to either your hand or the battlefield.
  8. Repeat.
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