Infinite Reflection + Sepulchral Primordial + Umbral Collar Zealot

UB identity

Commander legal

The 3 combo pieces

What must be in place

You have a way to cause a nontoken creature to enter the battlefield under your control.

How to execute it

  1. Cause a nontoken creature to enter the battlefield under your control, which enters as a copy of Sepulchral Primordial due to Infinite Reflection.
  2. When the creature enters, it triggers. Holding priority, activate Umbral Collar Zealot by sacrificing the creature.
  3. Resolve the creature's trigger, putting a creature card from an opponent's graveyard onto the battlefield under your control as a copy of Sepulchral Primordial.
  4. Repeat from step 2.

What the combo produces