He goes to -4. Usually when you get a negative result for a calculation in Magic you just use 0, but life doubling is one of the few exceptions:
107.1b Most of the time, the Magic game uses only positive numbers and zero. You can’t choose a
negative number, deal negative damage, gain negative life, and so on. However, it’s possible for
a game value, such as a creature’s power, to be less than zero. If a calculation or comparison
needs to use a negative value, it does so. If a calculation that would determine the result of an
effect yields a negative number, zero is used instead, unless that effect sets a player’s life total
to a specific value, doubles a player’s life total, sets a creature’s power or toughness to a
specific value, or otherwise modifies a creature’s power or toughness.
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he swings at 1 life, and I lightning bolt him to -2 life. what happens with mantle's double his life total mandatory trigger?