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Magic: The Gathering Comprehensive Rules Changes

Planar Chaos to Future Sight (Single Change View)

General changes

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

500.5.

When determining what requirements could be obeyed without violating restrictions, you don't need to consider any options for a creature that don't satisfy a requirement on it. But you do need to consider any options for any creature(s) that will satisfy a requirement, as long as the total number of obeyed requirements is increased (even if the option means not obeying another requirement that was previously met).

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." The creature with no abilities isn't required to block. It's legal to declare both creatures as blockers, or to declare neither creature as a blocker, but illegal to block with only one of the two.