Hi! I was playing a mill deck in Expanded, and something weird happened. My opponent knocked out my dunsparce (which mills two cards when it dies) when their deck had no cards in it. And instead of it dying, the game threw an error and the dunsparce had 90 damage counters on it when it has 60 HP.
Of course, it didn’t affect the outcome of the game, but I thought you might want to take a look at that. Maybe you could include a check to see if a player has cards in their deck before forcing them to be discarded?