Cavern Harpy + Decoction Module + Primal Prayers

BGU identity

Commander legal

The 3 combo pieces

What must be in place

You have at least {E} or enough mana to cast Cavern Harpy

How to execute it

  1. Cast Cavern Harpy by paying {E} due to Primal Prayers, if able, or by paying its mana cost.
  2. When Cavern Harpy enters the battlefield, it and Decoction Module trigger.
  3. Resolve the Decoction Module trigger, causing you to get {E}.
  4. Resolve the Cavern Harpy trigger, returning it from the battlefield to your hand.
  5. Repeat.

What the combo produces