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)
Blocking Creature [Click to view all changes.]
Blocking Creature A creature becomes a blocking creature when (a) it's declared as part of a legal block during the combat phase and (b) all block costs have been paid. It remains a blocking creature until it's removed from combat, it stops being a creature, its controller changes, or the combat phase ends. Blocking creatures don't exist outside of the combat phase. See rule 309, "Declare Blockers Step."	Blocking Creature A creature becomes a blocking creature when (a) it's declared as part of a legal block during the combat phase and (b) all costs to block, if any, have been paid. It remains a blocking creature until it's removed from combat, it stops being a creature, its controller changes, or the combat phase ends. Blocking creatures don't exist outside of the combat phase. See rule 309, "Declare Blockers Step."

Old rule (Core Set - Ninth Edition)

New rule (Ravnica: City of Guilds)

Blocking Creature [Click to view all changes.]

Blocking Creature

A creature becomes a blocking creature when (a) it's declared as part of a legal block during the combat phase and (b) all block costs have been paid. It remains a blocking creature until it's removed from combat, it stops being a creature, its controller changes, or the combat phase ends. Blocking creatures don't exist outside of the combat phase. See rule 309, "Declare Blockers Step."

Blocking Creature

A creature becomes a blocking creature when (a) it's declared as part of a legal block during the combat phase and (b) all costs to block, if any, have been paid. It remains a blocking creature until it's removed from combat, it stops being a creature, its controller changes, or the combat phase ends. Blocking creatures don't exist outside of the combat phase. See rule 309, "Declare Blockers Step."