Karlov Watchdog + Phyrexian Altar + Yarus, Roar of the Old Gods + Zedruu the Greathearted

Mana needed: {U}{R}{W}

RGWU identity

Commander legal

The 4 combo pieces

What must be in place

You control a face-down creature whose front face is a permanent card.

How to execute it

  1. Activate Zedruu by paying {U}{R}{W}, 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