This clever life-gain loop relies on an infinite target-redirection trick: by repeatedly activating Outrider en-Kor's zero-cost ability to target your own Daru Spiritualist, you trigger the Spiritualist's passive ability over and over to stack an astronomical amount of toughness onto it. Because Outrider en-Kor's redirection ability doesn't actually require damage to be on the stack to be activated, you can pump this toughness infinitely right in the middle of your turn. Once your Cleric's toughness reaches game-breaking heights, you tap Miren, the Moaning Well to sacrifice Daru Spiritualist to its activation cost, cashing out that massive toughness stat for a game-winning mountain of life.