Mosswort Bridge and Negative Power

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I control Mosswort Bridge, a 10-power creature, and a creature with -1 power. Can I activate the Bridge?

(Assume the Druid has a -1/-1 counter on it)
No, you can't. The rules actually have an example which clarifies this.

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.
Example: If a 3/4 creature gets -5/-0, it’s a -2/4 creature. It assigns 0 damage in
combat. Its total power and toughness is 2. You’d have to give it +3/+0 to raise its
power to 1.
Rules Advisor
No.

The calculation will use the actual power of the creatures and will get a total power of 9, which isn't enough.