Mirrorpool + Splendid Reclamation + Need for Speed + Horizon Explorer

Mirrorpool

Splendid Reclamation

Need for Speed

Horizon Explorer

How it works

1. Cast Splendid Reclamation by paying 3.
2. Holding priority, activate any number of lands you control except Mirrorpool by tapping them, adding at least 2C.
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 2C, 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.

This fascinating loop turns your graveyard into an infinite engine by continually recycling your land base. It all kicks off with Splendid Reclamation to haul every land back home, where Horizon Explorer ensures they immediately enter untapped and ready to feed your mana pool. While Need for Speed lets you ruthlessly sacrifice your own lands to clear the path, Mirrorpool steps in as the grand finale, sacrificing itself to copy that original Splendid Reclamation and keep the cycle spinning endlessly.