Ugin's Nexus, Isochron Scepter, Vision Charm, and Mechanized Production

Prerequisites

• Ugin's Nexus on the battlefield
• Isochron Scepter on the battlefield
• Vision Charm in exile
• Mechanized Production on the battlefield
• each turn available

Steps

1. At the beginning of your upkeep, Mechanized Production triggers, creating a token copy of Ugin's Nexus
2. Put the Ugin's Nexus token into your graveyard due to the legend rule
3. The Ugin's Nexus token is exiled instead of being put into your graveyard, causing you to take an extra turn after this one
4. Activate Isochron Scepter by paying and tapping it, casting a copy of Vision Charm without paying its mana cost
5. Resolve the copy of Vision Charm, causing Ugin's Nexus to phase out until your next untap step
6. Move to your next turn, causing Ugin's Nexus to phase in during your untap step
7. Repeat

Results

• Infinite turns