Ugin's Nexus, and Masterful Replication

Prerequisites

• Ugin's Nexus in hand
• Masterful Replication on the battlefield
• You control at least one other artifact
• available

Steps

1. Cast Masterful Replication by paying , causing each artifact you control to become a copy of Ugin's Nexus until end of turn
2. Put the original Ugin's Nexus and all other artifacts you control except one into exile due to the legend rule and their replacement effects, causing you to take that many extra turns after this one

Results

• Near-infinite turns