The card Pathfinding is supposed to stop drawing cards when your deck is empty, but it doesn't. If you have one move card in your deck, it will just run through the entire deck then sit there forever. The only thing you can do is close and reopen the game and start the battle again. Version 3.228.0.12363 / 1.2.0
Thank you for finding this bug. Maybe now, Pathfinding'll FINALLY be safe to combo with Ancient Grudge for maximal Elf Wiz scariness.