Mendicant Core, Guidelight, Ugin's Nexus, and Meticulous Excavation

Prerequisites

• Mendicant Core, Guidelight on the battlefield
• Ugin's Nexus in hand
• Meticulous Excavation on the battlefield
• You have max speed
• each turn available

Steps

1. Cast Ugin's Nexus by paying
2. Mendicant Core triggers, copying the Ugin's Nexus spell
3. Resolve both Ugin's Nexus spells
4. The token Ugin's Nexus is put into exile due to the legend rule and its replacement effect, causing you to take an extra turn after this one
5. Activate Meticulous Excavation by paying , returning Ugin's Nexus from the battlefield to your hand
6. Repeat each turn

Results

• Infinite turns