You couldnt see the whole pack, but you could easily make out the front card and sometimes even the rare if you tilted it right
x1Foil card (of any rarity)
For this list we will not consider formats like Five Color, Type Four, Cube, or Pauper
Lorehold, the Historian Lorehold, the Historian is a two-parter
Anyway, mill is everywhere, and especially with escape, it's easy to incidentally assemble your graveyard as a redundant pile of impossible doom scenarios, all aimed your opponent
In all seriousness, though, a panic button available to any deck is something to be wary of, and its appreciated that designers were mindful to limit the potential for annoying scenarios by making this legendary and having it exile itself on activation