You know the drill: your opponent has basically established their win by playing some cards that you can't answer (for simplicity's sake, we'll call it Key/Vault), but they don't have a means on the board to reduce your life total to zero yet. You can't win, but they haven't exactly won either. What do you do?
In paper, I realize this question is more complicated and people often advise caution in attempting to play out the game, because it opens the door to accusations of slow play or stalling for time. But on MTGO, where you each have your own clock that acts as its own meta-resource, does the correct action change? In a practice game I'll generally just concede and move on with my life, but in league or tournament play there are prizes on the line, and taking 3-5 minutes off your opponent's clock by making them play out potentially a bunch of turns in order to actually win could end up winning you the match later on--but is that seen as legitimate, or what? How do people feel about leveraging the clock strategically in this way, and what's the etiquette here?