Driver of the Dead + Phantasmal Image + Yahenni, Undying Partisan

Driver of the Dead

Phantasmal Image

Yahenni, Undying Partisan

How it works

1. Activate Yahenni, Undying Partisan by sacrificing Phantasmal Image.
2. When Phantasmal Image dies, it triggers, returning itself from your graveyard to the battlefield as a copy of Driver of the Dead.
3. Resolve the Yahenni, Undying Partisan ability from step 1.
4. Repeat.

This clever loop relies on Phantasmal Image entering the battlefield as a copy of Driver of the Dead, creating a perpetual motion machine in the graveyard. Once you sacrifice that copy to Yahenni, Undying Partisan, the Driver of the Dead trigger puts the Image right back onto the battlefield, where it can immediately copy the Driver of the Dead waiting in your graveyard. Because Yahenni, Undying Partisan also grows larger with every iteration, you not only generate infinite death and sacrifice triggers, but you also end up with an arbitrarily massive, indestructible threat.