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

Old rule (Planar Chaos)	New rule (Future Sight)
500.2. [Click to view all changes.]
500.2. As part of declaring attackers, the active player checks each creature he or she controls to see whether it must attack, can't attack, or has some other attacking restriction or requirement. If such a restriction or requirement conflicts with the proposed attack, the attack is illegal, and the active player must then propose another set of attacking creatures. (Tapped creatures and creatures with unpaid costs to attack are exempt from effects that would require them to attack.) Example: A player controls two creatures, each with a restriction that states "[This creature] can't attack alone." It's legal to declare both as attackers. Example: A player controls two creatures: one that "attacks if able" and one with no abilities. An effect states, "No more than one creature may attack each turn." The only legal attack is for just the creature that "attacks if able" to attack. It's illegal to attack with the other creature, attack with both, or attack with neither.	500.2. As part of declaring attackers, the active player checks each creature he or she controls to see whether it must attack, can't attack, or is affected by some other attacking restriction or requirement. If such a restriction or requirement conflicts with the proposed attack, the attack is illegal, and the active player must then propose another set of attacking creatures. (Tapped creatures and creatures with unpaid costs to attack are exempt from effects that would require them to attack.) Example: A player controls two creatures, each with a restriction that states "[This creature] can't attack alone." It's legal to declare both as attackers. Example: A player controls two creatures: one that "attacks if able" and one with no abilities. An effect states, "No more than one creature can attack each turn." The only legal attack is for just the creature that "attacks if able" to attack. It's illegal to attack with the other creature, attack with both, or attack with neither.

Old rule (Planar Chaos)

New rule (Future Sight)

500.2.

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

Example: A player controls two creatures, each with a restriction that states "[This creature] can't attack alone." It's legal to declare both as attackers.

Example: A player controls two creatures: one that "attacks if able" and one with no abilities. An effect states, "No more than one creature may attack each turn." The only legal attack is for just the creature that "attacks if able" to attack. It's illegal to attack with the other creature, attack with both, or attack with neither.

500.2.

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

Example: A player controls two creatures, each with a restriction that states "[This creature] can't attack alone." It's legal to declare both as attackers.

Example: A player controls two creatures: one that "attacks if able" and one with no abilities. An effect states, "No more than one creature can attack each turn." The only legal attack is for just the creature that "attacks if able" to attack. It's illegal to attack with the other creature, attack with both, or attack with neither.