Ashnod's Altar + Intruder Alarm + Othelm, Sigardian Outcast

GWU identity

Commander legal

The 3 combo pieces

What must be in place

You control at least one other nontoken creature.
Othelm does not have summoning sickness.

How to execute it

  1. Activate Ashnod's Altar by sacrificing any other nontoken creature, adding {C}{C}.
  2. Activate Othelm by paying {2} and tapping it, returning a creature from your graveyard to the battlefield.
  3. The creature enters the battlefield, triggering Intruder Alarm, untapping all creatures.
  4. Repeat.

What the combo produces