Mirrorpool + Splendid Reclamation + Overgrown Estate + Horizon Explorer

Mirrorpool

Splendid Reclamation

Overgrown Estate

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 Overgrown Estate 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 remarkable loop turns a graveyard full of discarded real estate into an infinite engine of mana, life, and landfall triggers. By using Overgrown Estate to feed lands to the graveyard while holding priority over a cast of Splendid Reclamation, you whittle your board down until only Mirrorpool remains to copy the spell. Once that copy resolves, Horizon Explorer steps in to ensure your lands return to the battlefield untapped rather than tapped, providing the exact resources needed to feed Mirrorpool's activation cost and repeat the cycle indefinitely.