Yarus, Roar of the Old Gods + Karlov Watchdog + Wrong Turn + Phantom Train

Yarus, Roar of the Old Gods

Karlov Watchdog

Wrong Turn

Phantom Train

How it works

1. Donate Karlov Watchdog to an opponent.
2. During the opponent's turn, activate Phantom Train by sacrificing a face-down creature you control.
3. When the creature dies, Yarus's second ability triggers, returning it from your graveyard to the battlefield face-down as a 2/2 creature, and then not turning it face-up due to Karlov Watchdog.
4. Resolve the Phantom Train ability.
5. Repeat from step 2.

This clever loop turns the graveyard into a revolving door by weaponizing rules interactions with your own permanents. You begin by forcing Karlov Watchdog onto an opponent using Wrong Turn, locking down their ability to turn things face up on your turn. With that restriction in place, you use Phantom Train to repeatedly sacrifice a face-down creature to grow the Vehicle while triggering Yarus, Roar of the Old Gods. Because Yarus attempts to return the sacrificed creature and immediately turn it face up, Karlov Watchdog's static ability interferes—preventing the face-up transition and leaving the creature permanently trapped in a perpetual cycle of leaving and entering the battlefield face down.