Mishra, Eminent One + Ugin's Nexus + Master Transmuter

Mishra, Eminent One

Ugin's Nexus

Master Transmuter

How it works

1. At the beginning of your combat phase, Mishra triggers, creating a token copy of Ugin's Nexus that is a 4/4 Construct artifact creature named Mishra's Warform in addition to its other types.
2. Activate Master Transmuter by paying , tapping it and returning Ugin's Nexus to hand, choosing not to put an artifact onto the battlefield.
3. At the beginning of your end step, Mishra triggers, causing you to exile Mishra's Warform and take an extra turn after this one.
4. Move to your next turn.
5. Cast Ugin's Nexus by paying 5.
6. Repeat.