This clever interaction transforms a single instance of damage into a devastating board wipe by creating a closed loop between High Priest of Penance and the transformed face of Ill-Tempered Loner // Howlpack Avenger. Once you deal initial damage to High Priest of Penance, its triggered ability goes on the stack to destroy a nonland permanent while simultaneously triggering Howlpack Avenger's nightbound ability to ping High Priest of Penance right back. This self-sustaining cycle repeats endlessly, letting you systematically dismantle every nonland permanent your opponents control until the board is completely empty.