With shared fate, each player must draw from their opponents library (and then exile that card, and can play exiled cards from that library.) When you destroy your own library, you eliminate their ability to draw cards; if they can't win with the cards they have out, they pretty much lose.
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Alright. I agree with the 1 and 2 offs, but many of them are the same or similar cards with different names. I agree with the mana thing as well, I'll take a look at that.