Phenomenon Investigators, Ugin's Nexus, and Replication Specialist

Prerequisites

• Phenomenon Investigators on the battlefield
• Ugin's Nexus in hand
• Replication Specialist on the battlefield
• each turn available

Steps

1. Cast Ugin's Nexus by paying
2. When Ugin's Nexus enters the battlefield, Replication Specialist triggers, causing you to pay to create a token copy of Ugin's Nexus
3. Put the token Ugin's Nexus into exile due to the legend rule and the token's replacement effect, causing you to take an extra turn after this one
4. At the beginning of your end step, Phenomenon Investigators triggers, returning Ugin's Nexus from the battlefield to your hand and causing you to draw a card
5. Repeat during each of your turns

Results

• Infinite turns