Ugin's Nexus + Masterful Replication

Ugin's Nexus

Masterful Replication

How it works

1. Cast Masterful Replication by paying 5, 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.