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That might sound like a lot of protection, but think of it like this: If your deck is completely shut off when the commander or a similarly critical piece isnt in play, your opponents can beat you with a Swords to Plowshares or two
So what does "staying open" mean
In some rare occasions you might run into decks that are all about face-down cards such as Kadena, Slinking Sorcerer or Kaust, Eyes of the Glade, which naturally can turn cards face-up or have supporting spells that can
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If you can find a way to recast it from your graveyard, say with a Mystic Sanctuary, you can stop your opponent from ever taking a turn