Mirrorpool + Splendid Reclamation + Spelunking + Need for Speed

Mirrorpool

Splendid Reclamation

Spelunking

Need for Speed

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 Spelunking.
7. Repeat from step 2.

This elegant loop turns your graveyard into an engine of recursive growth by leveraging Spelunking, whose passive ability ensures every land brought back enters the battlefield untapped and ready to use. You start by sacrificing your entire land base to fuel Need for Speed, leaving Mirrorpool as your sole remaining land so it can be sacrificed to copy the original Splendid Reclamation on the stack. As the copied Splendid Reclamation resolves, it dumps all those sacrificed lands right back onto the battlefield via Spelunking, where they immediately untap and can be tapped for mana before you repeat the process. Because Mirrorpool is sent to the graveyard along with your other lands, it is successfully recovered by each iteration of Splendid Reclamation, allowing you to endlessly copy the spell and generate infinite mana, landfall triggers, and magecraft triggers.