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)
418.5e. [Click to view all changes.]
418.5e. An object's timestamp is the time it entered the zone it's currently in, with three exceptions: (1) If two or more objects enter a zone (or zones) simultaneously, the active player determines their timestamp order at the time they enter that zone. (2) Whenever an Aura or Equipment becomes attached to a permanent, the Aura or Equipment receives a new timestamp. (3) Permanents that phase in keep the same timestamps they had when they phased out.	418.5e. An object's timestamp is the time it entered the zone it's currently in, with three exceptions: (a) If two or more objects enter a zone (or zones) simultaneously, the active player determines their timestamp order at the time they enter that zone. (b) Whenever an Aura or Equipment becomes attached to a permanent, the Aura or Equipment receives a new timestamp. (c) Permanents that phase in keep the same timestamps they had when they phased out.

Old rule (Core Set - Ninth Edition)

New rule (Ravnica: City of Guilds)

418.5e.

An object's timestamp is the time it entered the zone it's currently in, with three exceptions: (1) If two or more objects enter a zone (or zones) simultaneously, the active player determines their timestamp order at the time they enter that zone. (2) Whenever an Aura or Equipment becomes attached to a permanent, the Aura or Equipment receives a new timestamp. (3) Permanents that phase in keep the same timestamps they had when they phased out.

418.5e.

An object's timestamp is the time it entered the zone it's currently in, with three exceptions: (a) If two or more objects enter a zone (or zones) simultaneously, the active player determines their timestamp order at the time they enter that zone. (b) Whenever an Aura or Equipment becomes attached to a permanent, the Aura or Equipment receives a new timestamp. (c) Permanents that phase in keep the same timestamps they had when they phased out.