Open zones are those in which all players can see the faces of cards in them, excluding cards that are in them face down as a result of an effect
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That means you can be a bit more thrifty when it comes to making ink, and squeeze out a few more low-cost cards using less ink when the pressure is on
In addition to the rare dual lands and regular commons, uncommons, rares, and mythic rares, this slot can include a card with the showcase magnified, showcase dossier, borderless, or Ravnica City treatment
2021-03-19 If for some reason you can't win the game (because your opponent has cast Angel's Grace this turn, for example), you won't lose for having tried to draw a card from a library with no cards in it
This mechanic can close out games in a matter of turns, taking only a little bit of effort to reach critical mass