After learning about the Legendary Pokmon Kyurem, which arrived at the Giant Chasm years ago, the player discovers that Neo Team Plasma is working to use Kyurem to take over the world, harnessing its power to freeze large portions of Unova, including Opelucid City
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It makes the combat phase, which Wizards have been trying to turn the game more focused on for some years now, more complex, while favoring the use of Battles with immediate effects, previously seen in Sorceries or Enchantments
(If a creature with a finality counter on it would die, exile it instead.) So, fairly self-explanatory here, if a permanent has a Finality Counter on it, and that permanent would die, it doesn't hit the graveyard