Yarus, Roar of the Old Gods + Karlov Watchdog + Viscera Seer + Bazaar Trader

Yarus, Roar of the Old Gods

Karlov Watchdog

Viscera Seer

Bazaar Trader

How it works

1. Activate Bazaar Trader by tapping it, giving control of Karlov Watchdog to an opponent.
2. During the opponent's turn, activate Viscera Seer 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 Viscera Seer ability.
5. Repeat from step 2.