This clever loop turns Woe Strider into an endless engine of sacrifice by leveraging a continuous color-shifting enchantment. Because Darkest Hour makes every creature on the board black, every token created by Teysa, Orzhov Scion immediately triggers her own second ability whenever it goes to the graveyard. When you sacrifice a creature to Woe Strider, its death feeds Teysa to spawn a fresh Spirit token, perfectly replacing the sacrifice and allowing you to repeat the process infinitely.