Yarus, Roar of the Old Gods + Karlov Watchdog + Yahenni, Undying Partisan + Stiltzkin, Moogle Merchant

Yarus, Roar of the Old Gods

Karlov Watchdog

Yahenni, Undying Partisan

Stiltzkin, Moogle Merchant

How it works

1. Activate Stiltzkin by paying 2 and tapping it, giving control of Karlov Watchdog to an opponent.
2. During the opponent's turn, activate Yahenni 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 Yahenni ability.
5. Repeat from step 2.