This is a really interesting question
Specifically, whenever an effect asks you to draw a card and your library is empty, you lose the next time a player would receive priority (which, in practice, pretty much means on the spot , regardless of what's in play or on the stack)
Some Creatures with Banding As you can imagine, Wizards of the Coast stopped printing cards with Banding a long time ago
What makes Reaper superior to Grim is that it gives you a card when it dies making it a vastly better curve and setup play
Additionally, if you attacked with three or more creatures this turn, you can tap and pay one white to play the exiled card without paying its mana cost
One Shantotto is enough to set me down the path, or getting multiple copies of Thunder / Ice Magic, or Sahagin