Bjorna, Nightfall Alchemist + Cathodion + Intruder Alarm + Othelm, Sigardian Outcast

RGWU identity

Commander legal

The 4 combo pieces

What must be in place

Bjorna and Othelm do not have summoning sickness.

How to execute it

  1. Activate Bjorna by tapping it and sacrificing Cathodion, targeting any creature.
  2. Cathodion dies, adding {C}{C}{C}.
  3. Activate Othelm by paying {2} and tapping it, returning Cathodion from your graveyard to the battlefield.
  4. Cathodion enters the battlefield, triggering Intruder Alarm, untapping all creatures.
  5. Repeat an arbitrarily large number of times.
  6. Resolve all Bjorna abilities, dealing infinite damage to any creature(s).

What the combo produces