Hell's Caretaker + Intruder Alarm

UB identity

Commander legal

The 2 combo pieces

What must be in place

Hell's Caretaker does not have summoning sickness.
It is your upkeep step.
You have at least one creature card in your graveyard and at least one additional nontoken creature on the battlefield.

How to execute it

  1. Tap Hell's Caretaker and sacrifice another creature to returning a creature in your graveyard to the battlefield.
  2. When that creature enters the battlefield, Intruder Alarm triggers untapping all creatures.
  3. Repeat.

What the combo produces