Isochron Scepter, Osgir, the Reconstructor, Pull from Eternity, and Ugin's Nexus

Prerequisites

• Isochron Scepter on the battlefield
• Osgir, the Reconstructor on the battlefield
• Pull from Eternity in exile
• Ugin's Nexus in your graveyard
• Osgir does not have summoning sickness
• each turn available

Steps

1. Activate Osgir by tapping it, paying , and exiling Ugin's Nexus from your graveyard, creating two token copies of Ugin's Nexus
2. Put one of them into your graveyard due to the legend rule
3. The token copy of Ugin's Nexus that was just put into your graveyard triggers, causing you to take an extra turn after this one
4. Activate Osgir by paying and sacrificing a token copy of Ugin's Nexus
5. The sacrificed token copy of Ugin's Nexus triggers, causing you to take an extra turn after this one
6. Osgir's ability resolves, giving target creature you control +2/+0 until end of turn
7. Move to your next extra turn
8. Activate Isochron Scepter by tapping it and paying , copying Pull from Eternity
9. Cast Pull from Eternity, returning Ugin's Nexus to your graveyard
10. Move to your next extra turn
11. Repeat

Results

• Infinite turns