Toph, the First Metalbender + Ugin's Nexus + Meticulous Excavation + Krark-Clan Ironworks

Toph, the First Metalbender

Ugin's Nexus

Meticulous Excavation

Krark-Clan Ironworks

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 Krark-Clan Ironworks by sacrificing Ugin's Nexus, adding CC. 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. Activate Meticulous Excavation by paying 2, returning Ugin's Nexus from the battlefield to your hand.
6. Repeat each turn.

This clever loop centers around Ugin's Nexus, which normally just gifts you a single extra turn when it hits the graveyard, but here becomes a renewable resource thanks to Toph, the First Metalbender turning your nontoken artifacts into lands. When you sacrifice Ugin's Nexus to Krark-Clan Ironworks for mana, its replacement effect exiles it instead of letting it go to the graveyard—which cleverly bypasses its "extra turns are skipped" clause entirely while still granting you an extra turn! Meticulous Excavation then allows you to complete the cycle by picking up pieces or resetting your board state, ensuring you can repeat the process indefinitely to lock down the game.