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

Silas Renn, Seeker Adept

Ugin's Nexus

Isochron Scepter

Pull from Eternity

Sarcatog

How it works

1. Activate Sarcatog's second ability by sacrificing Ugin's Nexus, giving it +1/+1 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.