Magic: The Gathering Comprehensive Rules Changes - Time Spiral to Planar Chaos

Old rule (Time Spiral)	New rule (Planar Chaos)
Number [Click to view all changes.]
Number The Magic game uses only natural numbers. You may not choose a fractional number, deal fractional damage, and so on. When a spell or ability could generate a fractional number, the spell or ability will tell you whether to round up or down. See rule 104, "Numbers and Symbols." If a creature's power or toughness, a mana cost, a player's life total, or an amount of damage is less than zero, it's treated as zero for all purposes except changing that total. If anything needs to use a number that can't be determined, it uses 0 instead. Example: If a 3/3 creature gets -5/-0, it deals 0 damage in combat. But to raise its power back to 1, you'd have to give it +3/+0 (3 minus 5 plus 3 is 1).	Number The Magic game uses only natural numbers. You may not choose a fractional number, deal fractional damage, and so on. When a spell or ability could generate a fractional number, the spell or ability will tell you whether to round up or down. See rule 104, "Numbers and Symbols." If a numerical value (such as a creature's power, toughness, or total power and toughness; a mana cost; a player's life total; or an amount of damage) is less than 0, it's treated as 0 for all purposes except changing that total, if applicable. If anything needs to use a number that can't be determined, it uses 0 instead. Example: If a 3/3 creature gets -5/-0, it deals 0 damage in combat. But to raise its power back to 1, you'd have to give it +3/+0 (3 minus 5 plus 3 is 1).

Old rule (Time Spiral)

New rule (Planar Chaos)

Number

The Magic game uses only natural numbers. You may not choose a fractional number, deal fractional damage, and so on. When a spell or ability could generate a fractional number, the spell or ability will tell you whether to round up or down. See rule 104, "Numbers and Symbols." If a creature's power or toughness, a mana cost, a player's life total, or an amount of damage is less than zero, it's treated as zero for all purposes except changing that total. If anything needs to use a number that can't be determined, it uses 0 instead.

Example: If a 3/3 creature gets -5/-0, it deals 0 damage in combat. But to raise its power back to 1, you'd have to give it +3/+0 (3 minus 5 plus 3 is 1).

Number

The Magic game uses only natural numbers. You may not choose a fractional number, deal fractional damage, and so on. When a spell or ability could generate a fractional number, the spell or ability will tell you whether to round up or down. See rule 104, "Numbers and Symbols." If a numerical value (such as a creature's power, toughness, or total power and toughness; a mana cost; a player's life total; or an amount of damage) is less than 0, it's treated as 0 for all purposes except changing that total, if applicable. If anything needs to use a number that can't be determined, it uses 0 instead.

Example: If a 3/3 creature gets -5/-0, it deals 0 damage in combat. But to raise its power back to 1, you'd have to give it +3/+0 (3 minus 5 plus 3 is 1).