Silas Renn, Seeker Adept + Ugin's Nexus + Isochron Scepter + Pull from Eternity + Atog

Silas Renn, Seeker Adept

Ugin's Nexus

Isochron Scepter

Pull from Eternity

Atog

How it works

1. Activate Atog by sacrificing Ugin's Nexus, giving it +2/+2 until end of turn.
2. When Ugin's Nexus is sacrificed, it is exiled instead of being put into your graveyard, causing you to take an extra turn after this one.
3. Move to your next turn.
4. Activate Isochron Scepter by paying 2 and tapping it, casting a copy of Pull from Eternity without paying its mana cost.
5. Resolve Pull from Eternity, putting Ugin's Nexus from exile into your graveyard.
6. Deal combat damage to an opponent using Silas Renn, triggering Silas Renn, targeting Ugin's Nexus.
7. Cast Ugin's Nexus from your graveyard by paying 5.
8. Repeat.

This ingenious loop leverages Atog as a reliable sacrifice outlet to bin Ugin's Nexus, turning its replacement effect into a guaranteed extra turn. From there, Isochron Scepter—imprinted with Pull from Eternity—rescues Ugin's Nexus from exile and returns it to your graveyard. Finally, Silas Renn, Seeker Adept puts all the pieces together by repeatedly recurring Ugin's Nexus from the graveyard through combat damage, locking down an endless stream of extra turns.