Negative Power

[fluffyn00b]

When Char-Rumbler attacks, and no abilities have been activated, does the opponent gain life?

[Rootbreaker]

No. Creatures with negative power are treated the same as creatures with zero power during combat damage assignment.

[paperwarrior]

Here's the rules quote in case you're curious:

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