Magic: The Gathering Comprehensive Rules Changes - Core Set - Ninth Edition to Ravnica: City of Guilds

Old rule (Core Set - Ninth Edition)	New rule (Ravnica: City of Guilds)
500.1. [Click to view all changes.]
500.1. Some effects restrict declaring attackers or blockers in combat or require certain creatures to be declared as attackers or blockers. (See rule 308, "Declare Attackers Step," and rule 309, "Declare Blockers Step.") A restriction is an effect which says that a creature can't block (or attack) or that it can't block (or attack) unless some condition is met. A requirement is an effect which says that a creature must block (or attack) or that it must block (or attack) if some condition is met.	500.1. Some effects restrict declaring attackers or blockers in combat or require certain creatures to be declared as attackers or blockers. (See rule 308, "Declare Attackers Step," and rule 309, "Declare Blockers Step.") A restriction is an effect that says a creature can't block (or attack) or it can't block (or attack) unless some condition is met. A requirement is an effect that says a creature must block (or attack) or it must block (or attack) if some condition is met.

Old rule (Core Set - Ninth Edition)

New rule (Ravnica: City of Guilds)

500.1.

Some effects restrict declaring attackers or blockers in combat or require certain creatures to be declared as attackers or blockers. (See rule 308, "Declare Attackers Step," and rule 309, "Declare Blockers Step.") A restriction is an effect which says that a creature can't block (or attack) or that it can't block (or attack) unless some condition is met. A requirement is an effect which says that a creature must block (or attack) or that it must block (or attack) if some condition is met.

500.1.

Some effects restrict declaring attackers or blockers in combat or require certain creatures to be declared as attackers or blockers. (See rule 308, "Declare Attackers Step," and rule 309, "Declare Blockers Step.") A restriction is an effect that says a creature can't block (or attack) or it can't block (or attack) unless some condition is met. A requirement is an effect that says a creature must block (or attack) or it must block (or attack) if some condition is met.