Magic: The Gathering Comprehensive Rules Changes - Planar Chaos to Future Sight

Old rule (Planar Chaos)	New rule (Future Sight)
208.2. [Click to view all changes.]
208.2. Some creature cards have power and/or toughness of , where * is a value determined* by the abilities of that object. As long as the object is in play, the ability sets the value of . The * is* 0 while the object is not in play.	208.2. Some creature cards have power and/or toughness represented by a instead* of a number. The object has a characteristic-defining ability that sets its power and/or toughness according to some stated condition. This ability functions in all zones. If the ability needs to use a number that can't be determined, use 0 instead of that number. Example: Lost Order of Jarkeld has power and toughness each equal to 1+. It says "As Lost Order of Jarkeld comes into play, choose an opponent" and "Lost Order of Jarkeld's power and toughness are each equal to 1 plus the number of creatures that opponent controls." While Lost Order of Jarkeld isn't* in play, there won't be a chosen opponent. Its power and toughness will each be equal to 1 plus 0, so it's a 1/1.

Old rule (Planar Chaos)

New rule (Future Sight)

208.2.

Some creature cards have power and/or toughness of *, where * is a value determined by the abilities of that object. As long as the object is in play, the ability sets the value of *. The * is 0 while the object is not in play.

208.2.

Some creature cards have power and/or toughness represented by a * instead of a number. The object has a characteristic-defining ability that sets its power and/or toughness according to some stated condition. This ability functions in all zones. If the ability needs to use a number that can't be determined, use 0 instead of that number.

Example: Lost Order of Jarkeld has power and toughness each equal to 1+*. It says "As Lost Order of Jarkeld comes into play, choose an opponent" and "Lost Order of Jarkeld's power and toughness are each equal to 1 plus the number of creatures that opponent controls." While Lost Order of Jarkeld isn't in play, there won't be a chosen opponent. Its power and toughness will each be equal to 1 plus 0, so it's a 1/1.