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Magic: The Gathering Comprehensive Rules Changes

Masters Edition to Lorwyn (Single Change View)

General changes

Old rule (Masters Edition) New rule (Lorwyn)

309.2e.

Each chosen creature becomes a blocking creature, but only if it's controlled by the defending player. Each one is blocking the attacking creature chosen for it. It remains a blocking creature until it's removed from combat or the combat phase ends, whichever comes first. See rule 306.2.

309.2e.

Each chosen creature becomes a blocking creature, but only if it's controlled by the defending player. Each one is blocking the attacking creature chosen for it. It remains a blocking creature until it's removed from combat or the combat phase ends, whichever comes first. See rule 306.4.