Mikaeus, the Unhallowed + Phyrexian Altar + Solemnity

WB identity

Commander legal

The 3 combo pieces

What must be in place

You control at least one additional nontoken, non-Human creature that does not have a +1/+1 counter on it.

How to execute it

  1. Activate Phyrexian Altar by sacrificing the additional creature, adding one mana of any color.
  2. When the creature dies, its undying ability triggers, returning it to the battlefield from your graveyard with zero +1/+1 counters due to Solemnity.
  3. Repeat.

What the combo produces