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

Old rule (Planar Chaos)	New rule (Future Sight)
500.3. [Click to view all changes.]
500.3. As part of declaring blockers, the defending player checks each creature he or she controls to see whether it must block, can't block, or has some other blocking restriction or requirement. If such a restriction or requirement conflicts with the proposed set of blocking creatures, the block is illegal, and the defending player must then propose another set of blocking creatures. (Tapped creatures and creatures with unpaid costs to block are exempt from effects that would require them to block.)	500.3. As part of declaring blockers, the defending player checks each creature he or she controls to see whether it must block, can't block, or is affected by some other blocking restriction or requirement. If such a restriction or requirement conflicts with the proposed set of blocking creatures, the block is illegal, and the defending player must then propose another set of blocking creatures. (Tapped creatures and creatures with unpaid costs to block are exempt from effects that would require them to block.)

Old rule (Planar Chaos)

New rule (Future Sight)

500.3.

As part of declaring blockers, the defending player checks each creature he or she controls to see whether it must block, can't block, or has some other blocking restriction or requirement. If such a restriction or requirement conflicts with the proposed set of blocking creatures, the block is illegal, and the defending player must then propose another set of blocking creatures. (Tapped creatures and creatures with unpaid costs to block are exempt from effects that would require them to block.)

500.3.

As part of declaring blockers, the defending player checks each creature he or she controls to see whether it must block, can't block, or is affected by some other blocking restriction or requirement. If such a restriction or requirement conflicts with the proposed set of blocking creatures, the block is illegal, and the defending player must then propose another set of blocking creatures. (Tapped creatures and creatures with unpaid costs to block are exempt from effects that would require them to block.)