Ugin's Nexus, Esoteric Duplicator, and Krark-Clan Ironworks

Prerequisites

• Ugin's Nexus on the battlefield
• Esoteric Duplicator on the battlefield
• Krark-Clan Ironworks on the battlefield

Steps

1. During your end step, activate Krark-Clan Ironworks by sacrificing Ugin's Nexus, adding
2. Ugin's Nexus is exiled instead of being put into your graveyard, causing you to take an extra turn after this one
3. Esoteric Duplicator triggers, causing you to pay to create a token copy of Ugin's Nexus at the beginning of your next end step
4. Move to your extra turn
5. At the beginning of your end step, Esoteric Duplicator triggers, creating a token copy of Ugin's Nexus
6. Repeat

Results

• Infinite turns