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

Old rule (Planar Chaos)	New rule (Future Sight)
413.2f. [Click to view all changes.]
413.2f. If an effect requires information from the game (such as the number of creatures in play), the answer is determined only once, when the effect is applied. The effect uses the current information of a specific permanent if that permanent is still in play, or of a specific card in the stated zone; otherwise, the effect uses the last known information the object had before leaving that zone. There are two exceptions. If an effect deals damage divided among some number of creatures or players, the amount and division were determined as the spell or ability was put into the stack; see rule 402.6. Also, static abilities can't use last known information; see rule 412.5. If the ability text states that an object does something, it's the object as it exists (or most recently existed) that does it, not the ability.	413.2f. If an effect requires information from the game (such as the number of creatures in play), the answer is determined only once, when the effect is applied. If the effect requires information from a specific object, including the source of the ability itself, the effect uses the current information of that object if it hasn't changed zones; otherwise, the effect uses the last known information the object had before leaving the zone it was expected to be in. There are two exceptions. If an effect deals damage divided among some number of creatures or players, the amount and division were determined as the spell or ability was put into the stack; see rule 402.6. Also, static abilities can't use last known information; see rule 412.5. If the ability text states that an object does something, it's the object as it exists (or most recently existed) that does it, not the ability.

Old rule (Planar Chaos)

New rule (Future Sight)

413.2f.

If an effect requires information from the game (such as the number of creatures in play), the answer is determined only once, when the effect is applied. The effect uses the current information of a specific permanent if that permanent is still in play, or of a specific card in the stated zone; otherwise, the effect uses the last known information the object had before leaving that zone. There are two exceptions. If an effect deals damage divided among some number of creatures or players, the amount and division were determined as the spell or ability was put into the stack; see rule 402.6. Also, static abilities can't use last known information; see rule 412.5. If the ability text states that an object does something, it's the object as it exists (or most recently existed) that does it, not the ability.

413.2f.

If an effect requires information from the game (such as the number of creatures in play), the answer is determined only once, when the effect is applied. If the effect requires information from a specific object, including the source of the ability itself, the effect uses the current information of that object if it hasn't changed zones; otherwise, the effect uses the last known information the object had before leaving the zone it was expected to be in. There are two exceptions. If an effect deals damage divided among some number of creatures or players, the amount and division were determined as the spell or ability was put into the stack; see rule 402.6. Also, static abilities can't use last known information; see rule 412.5. If the ability text states that an object does something, it's the object as it exists (or most recently existed) that does it, not the ability.