This loop turns your battlefield into an unstoppable engine of perpetual motion, fueled entirely by the clever synergy between Teysa, Orzhov Scion, Darkest Hour, and Thermopod. Because Darkest Hour paints every single creature on the board black, every sacrifice made to Thermopod's mana ability immediately satisfies the death condition for Teysa's second ability. This instantly replaces your sacrificed creature with a fresh 1/1 white Spirit token, which immediately counts as a black creature ready to be fed back into Thermopod. The result is an endless cascade of sacrifices and spirit births that generates infinite red mana alongside infinite triggers for anything that cares about things entering, leaving, or dying.