Ugin's Nexus + Phenomenon Investigators + Mirrorworks

Ugin's Nexus

Phenomenon Investigators

Mirrorworks

How it works

1. Cast Ugin's Nexus by paying 5.
2. When Ugin's Nexus enters the battlefield, Mirrorworks triggers, causing you to pay 2 to create a token copy of Ugin's Nexus.
3. Put the token Ugin's Nexus into exile due to the legend rule and the token's replacement effect, causing you to take an extra turn after this one.
4. At the beginning of your end step, Phenomenon Investigators triggers, returning Ugin's Nexus from the battlefield to your hand and causing you to draw a card.
5. Repeat during each of your turns.