Resources

Magic: The Gathering Comprehensive Rules Changes

Morningtide to Shadowmoor (Single Change View)

General changes

Old rule (Morningtide) New rule (Shadowmoor)

104.1b.

Most of the time, the Magic game uses only positive numbers. 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 that would determine the result of an effect needs to use a negative value, it does so. If such a calculation yields a negative number, zero is used instead, unless that effect sets a creature's power or toughness, changes a creature's power or toughness, or sets a player's life total.

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

Example: Viridian Joiner is a 1/2 creature that says "{T}: Add an amount of {G} to your mana pool equal to Viridian Joiner's power." An effect gives it -2/-0, then its ability is activated. The ability adds no mana to your mana pool.

104.1b.

Most of the time, the Magic game uses only positive numbers. 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 that would determine the result of an effect needs to use a negative value, it does so. If such a calculation yields a negative number, zero is used instead, unless that effect sets a player's life total to a specific value, 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 deals no damage in combat. Its total power and toughness is 2. You'd have to give it +3/+0 to raise its power to 1.

Example: Viridian Joiner is a 1/2 creature that says "{T}: Add an amount of {G} to your mana pool equal to Viridian Joiner's power." An effect gives it -2/-0, then its ability is activated. The ability adds no mana to your mana pool.