Altar of Dementia + Blim, Comedic Genius + Karlov Watchdog + Yarus, Roar of the Old Gods

BRGW identity

Commander legal

The 4 combo pieces

What must be in place

Blim does not have summoning sickness and cannot be blocked by an opponent.
You control a face-down creature whose front face is a permanent card.

How to execute it

  1. Deal combat damage to an opponent using Blim. Blim triggers, giving control of Karlov Watchdog to an opponent.
  2. During the opponent's turn, activate Altar of Dementia 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 Altar of Dementia ability.
  5. Repeat from step 2.

What the combo produces