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)
Attack [Click to view all changes.]
Attack A creature attacks when it is declared as an attacker during the combat phase. (See rule 308, "Declare Attackers Step.") Playing a spell or ability (even during the combat phase) is never considered to be an attack.	Attack A creature attacks when it's declared as an attacker during the combat phase. (See rule 308, "Declare Attackers Step.") Playing a spell or ability (even during the combat phase) is never considered to be an attack.

Old rule (Core Set - Ninth Edition)

New rule (Ravnica: City of Guilds)

Attack

A creature attacks when it is declared as an attacker during the combat phase. (See rule 308, "Declare Attackers Step.") Playing a spell or ability (even during the combat phase) is never considered to be an attack.

Attack

A creature attacks when it's declared as an attacker during the combat phase. (See rule 308, "Declare Attackers Step.") Playing a spell or ability (even during the combat phase) is never considered to be an attack.