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Cumulative upkeep — Remove 5 abiss counters from permanents you control. Then when there are no abiss counters on Mastery of the Abiss-Masters, exile it. When you do, you lose the game. Hexproof, protection from white You can’t lose the game and your opponents can’t win the game. At the beginning of your upkeep, your life total becomes 1. If you lost life this way, put that many abiss counters on Mastery of the Abiss-Masters. If you gained life this way, remove that many abiss counters from it.