Magic: The Gathering Comprehensive Rules Changes - Eventide to Shards of Alara

Old rule (Eventide)	New rule (Shards of Alara)
Block Alone [Click to view all changes.]
Block Alone A creature is blocking alone when it's the sole creature controlled by the defending player declared as a blocker in a given combat phase. See rule 306.5.	Block Alone A creature blocks alone if it's the only creature declared as a blocker during the declare blockers step. A creature is blocking alone if it's blocking but no other creatures are. See rule 306.5.

Old rule (Eventide)

New rule (Shards of Alara)

Block Alone [Click to view all changes.]

Block Alone

A creature is blocking alone when it's the sole creature controlled by the defending player declared as a blocker in a given combat phase. See rule 306.5.

Block Alone

A creature blocks alone if it's the only creature declared as a blocker during the declare blockers step. A creature is blocking alone if it's blocking but no other creatures are. See rule 306.5.