Cauldron Familiar + Intruder Alarm + Karn, the Great Creator + Witch's Oven

UB identity

Commander legal

The 4 combo pieces

What must be in place

Witch's Oven does not have summoning sickness.

How to execute it

  1. Activate Karn's first ability by putting a loyalty counter on it, causing Witch's Oven to become an artifact creature until end of turn.
  2. Activate Witch's Oven by tapping it and sacrificing Cauldron Familiar, creating a Food token.
  3. Activate Cauldron Familiar by sacrificing a Food token, returning it from your graveyard to the battlefield.
  4. Cauldron Familar enters the battlefield, triggering Intruder Alarm, untapping all creatures.
  5. Repeat from step 2.

What the combo produces