Nyssa of Traken, Ugin's Nexus, and Esoteric Duplicator

Prerequisites

• Nyssa of Traken on the battlefield
• Ugin's Nexus on the battlefield
• Esoteric Duplicator on the battlefield
• Nyssa does not have summoning sickness and cannot be blocked and killed by an opponent
• each turn available

Steps

1. Declare Nyssa as an attacker
2. Nyssa triggers, causing you to sacrifice Ugin's Nexus and draw a card
3. Ugin's Nexus is exiled instead of being put into your graveyard, causing you to take an extra turn after this one
4. Esoteric Duplicator triggers, causing you to pay to create a token copy of Ugin's Nexus at the beginning of your next end step
5. Move to your extra turn
6. At the beginning of your end step, Esoteric Duplicator triggers, creating a token copy of Ugin's Nexus
7. Repeat

Results

• Infinite turns