Requires

Orvar, the All-Form must be on the battlefield. Ugin's Nexus must be on the battlefield. Capsize must be in hand. Mana needed: each turn

Steps

1. Cast Capsize paying for buyback targeting Ugin's Nexus.
2. Orvar triggers, creating a token copy of Ugin's Nexus.
3. The token copy of Ugin's Nexus is put into the graveyard due to the legend rule.
4. The Ugin's Nexus copy triggers, exiling itself and you take an extra turn after this one.
5. Resolve Capsize returning itself and Ugin's Nexus to your hand.
6. Pass the turn.
7. Cast Ugin's Nexus.
8. Repeat.

Results