Cavern Harpy + Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Intruder Alarm

WUB identity

Commander legal

The 3 combo pieces

What must be in place

You are able to pay to cast Cavern Harpy using any combination of mana-producing creatures and/or creatures that can reduce its cost using convoke.

How to execute it

  1. Cast Cavern Harpy by paying its mana cost reduced by the number of creatures you can tap while casting it.
  2. When Cavern Harpy enters, it and Intruder Alarm trigger.
  3. Resolve the Cavern Harpy trigger, returning it from the battlefield to your hand.
  4. Resolve the Intruder Alarm trigger, untapping all creatures.
  5. Repeat.

What the combo produces