Muldrotha, the Gravetide + Ugin's Nexus + Isochron Scepter + Pull from Eternity + Phantom Train

Muldrotha, the Gravetide

Ugin's Nexus

Isochron Scepter

Pull from Eternity

Phantom Train

How it works

1. Activate Phantom Train by sacrificing Ugin's Nexus
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. Cast Ugin's Nexus from your graveyard by paying 5.
7. Repeat.

This brilliant engine locks down your opponents by looping infinite extra turns through a clever cycle of sacrifice and recovery. It all begins by feeding Ugin's Nexus to Phantom Train, which sends the artifact into exile to trigger its coveted extra turn instead of letting it hit the graveyard. From there, Isochron Scepter repeatedly casts Pull from Eternity to pluck Ugin's Nexus right out of exile and drop it back into your graveyard. Finally, Muldrotha, the Gravetide steps in to anchor the loop, allowing you to recast Ugin's Nexus straight from your graveyard so you can feed it to the Train all over again.