Yarus, Roar of the Old Gods + Karlov Watchdog + Donate + Yahenni, Undying Partisan

Yarus, Roar of the Old Gods

Karlov Watchdog

Donate

Yahenni, Undying Partisan

How it works

1. Cast Donate by paying its mana cost, 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.