Guan Yu, Sainted Warrior + Remembrance + Deathrender + Yahenni, Undying Partisan

Guan Yu, Sainted Warrior

Remembrance

Deathrender

Yahenni, Undying Partisan

How it works

1. Activate Yahenni by sacrificing Guan Yu.
2. When Guan Yu dies, it, Deathrender and Remembrance trigger.
3. Resolve the Guan Yu trigger, causing you to shuffle it into your library from your graveyard.
4. Resolve the Remembrance trigger, causing you to search your library for Guan Yu and put it into your hand.
5. Resolve the Deathrender trigger, putting Guan Yu from your hand onto the battlefield, and attaching Deathrender to it.
6. Resolve the Yahenni ability, giving it indestructible until end of turn.
7. Repeat.

This ingenious loop turns Yahenni, Undying Partisan into an engine of perpetual motion by sacrificing Guan Yu, Sainted Warrior to grant Yahenni temporary indestructible. The moment Guan Yu hits the graveyard, a cascade of triggers responds: Guan Yu's own static replacement effect lets it shuffle into your library, Remembrance snatches it right back out of your library and straight into your hand, and Deathrender immediately deploys Guan Yu back onto the battlefield while re-equipping itself. This seamlessly sets up the exact board state you started with, allowing you to repeat the sacrifice infinitely to generate boundless death, entry, and leave-the-battlefield triggers.