Cavern Harpy + Guide of Souls + Primal Prayers

GWUB 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 Guide of Souls trigger.
  3. Resolve the Guide of Souls trigger, causing you to get {E} and gain 1 life.
  4. Resolve the Cavern Harpy trigger, returning it from the battlefield to your hand.
  5. Repeat.

What the combo produces