Resources

Magic: The Gathering Comprehensive Rules Changes

Planar Chaos to Future Sight (Single Change View)

General changes

Old rule (Planar Chaos) New rule (Future Sight)

500.4.

A restriction conflicts with a proposed set of attackers or blockers if it isn't being followed. A requirement conflicts with a proposed set of attackers or blockers if it isn't being followed and (1) the requirement could be obeyed without violating a restriction and (2) doing so will allow the total number of requirements that the set obeys to increase.

500.4.

A restriction conflicts with a proposed set of attackers or blockers if it isn't being followed. A requirement conflicts with a proposed set of attackers or blockers if it isn't being followed and (1) the requirement could be obeyed without violating a restriction and (2) doing so will allow the total number of requirements that the set obeys to increase. If there are multiple scenarios in which all restrictions are being followed and the maximum possible number of requirements are being followed (even if not all of them are), then any of those scenarios are legal.

Example: A player controls one creature that "blocks if able" and another creature with no abilities. An effect states, "Creatures can't be blocked except by two or more creatures." Having only the first creature block violates the restriction. Having neither creature block fulfills the restriction but not the requirement. Having both creatures block the same attacking creature fulfills both the restriction and the requirement, so that's the only option.