Bazaar Trader + Karlov Watchdog + Phyrexian Altar + Yarus, Roar of the Old Gods

RGW identity

Commander legal

The 4 combo pieces

What must be in place

Bazaar Trader does not have summoning sickness.
You control a face-down creature whose front face is a permanent card.

How to execute it

  1. Activate Bazaar Trader by tapping it, giving control of Karlov Watchdog to an opponent.
  2. During the opponent's turn, activate Phyrexian Altar by sacrificing a face-down creature you control, adding one mana of any color.
  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. Repeat from step 2.

What the combo produces