Bello, Bard of the Brambles + Ugin's Nexus + Bramble Sovereign + Meticulous Excavation

Bello, Bard of the Brambles

Ugin's Nexus

Bramble Sovereign

Meticulous Excavation

How it works

1. Cast Ugin's Nexus by paying 5.
2. When Ugin's Nexus enters the battlefield as a 4/4 Elemental due to Bello, Bramble Sovereign, causing you to pay 1 to create a token copy of Ugin's Nexus.
3. Put the token Ugin's Nexus into exile due to the legend rule and its replacement effect, causing you to take an extra turn after this one.
4. Activate Meticulous Excavation by paying 2, returning Ugin's Nexus from the battlefield to your hand.
5. Repeat each turn.