Toph, the First Metalbender + Ugin's Nexus + Meticulous Excavation + Lithatog

Toph, the First Metalbender

Ugin's Nexus

Meticulous Excavation

Lithatog

How it works

1. Cast Ugin's Nexus by paying 5.
2. At the beginning of your end step, Toph triggers, causing Ugin's Nexus to become an artifact land creature.
3. Activate Lithatog by sacrificing Ugin's Nexus. Ugin's Nexus is exiled instead of being put into your graveyard, causing you to take an extra turn after this one.
4. Toph triggers, returning Ugin's Nexus from exile to the battlefield.
5. Resolve the Lithatog ability.
6. Activate Meticulous Excavation by paying 2, returning Ugin's Nexus from the battlefield to your hand.
7. Repeat each turn.

This loop hinges on Toph, the First Metalbender transforming your artifacts into lands, which cleverly allows Ugin's Nexus to qualify as a legal sacrifice target for Lithatog's land-sacrificing ability. When Ugin's Nexus is sent to the graveyard, its replacement effect exiles it instead and grants you an extra turn—which Toph then bypasses by immediately returning the Nexus to the battlefield as a land creature when it dies or is exiled! To keep the engine running, Meticulous Excavation provides a reliable backup channel to bounce the Nexus back to your hand if needed, letting you endlessly repeat this sequence to chain infinite turns.