Game unwinnable by either player, but kept going
Both my opponent and I used Book of Exalted Deeds on a Faceless Haven and neither of us was playing land destruction. This should result in a drawn game, but instead the game would never end. My opponent clearly was using a macro to just pass the turn after both of our decks were empty. I think there should be a manner to declare a game drawn when this results, rather than play a game of who can mindlessly pass the turn the most. This cost me the match in the Standard Metagame Challenge that would have pushed me from 5 packs to 10 packs.