Rule evolution
Rule 509.3d
Previously numbered 509.4d, 509.5d.
Earliest archived Rules release: 2009-10-01 · 3 wording revisions · 2 renumberings
Earliest archived Rules release509.4dDetails
An ability that reads "Whenever [this creature] becomes blocked by a creature, . . ." triggers once for each creature that blocks the named creature. It will also trigger if an effect causes a creature to block the attacking creature, even if it had already been blocked that combat. It won't trigger if the creature becomes blocked by an effect rather than a creature.
Wording changed509.4dDetails
An ability that reads "Whenever [this creature] becomes blocked by a creature, . . ." triggers once for each creature that blocks the named creature.
It will also trigger if an effect causes a creature to block the attacking creature, even if it had already been blocked that combat.It triggers if a creature is declared as a blocker for the attacking creature.It won't trigger if the creature becomes blocked by an effect rather than a creature.It will also trigger if an effect causes a creature to block the attacking creature, but only if it wasn't already blocking that attacking creature at that time. In addition, it will trigger if a creature is put onto the battlefield blocking that creature. It won't trigger if the creature becomes blocked by an effect rather than a creature.Renumbered
509.4d→ 509.5dDetailsPreviously
5. Turn Structure
509. Declare Blockers StepThen
5. Turn Structure
509. Declare Blockers StepAn ability that reads “Whenever [this creature] becomes blocked by a creature, . . .” triggers once for each creature that blocks the named creature. It triggers if a creature is declared as a blocker for the attacking creature. It will also trigger if an effect causes a creature to block the attacking creature, but only if it wasn’t already blocking that attacking creature at that time. In addition, it will trigger if a creature is put onto the battlefield blocking that creature. It won’t trigger if the creature becomes blocked by an effect rather than a creature.
Wording changed509.5dDetails
An ability that reads "Whenever [
thisa creature] becomes blocked by a creature, . . ." triggers once for each creature that blocks the named creature. It triggers if a creature is declared as a blocker for the attacking creature. It will also trigger if an effect causes a creature to block the attacking creature, but only if it wasn't already blocking that attacking creature at that time. In addition, it will trigger if a creature is put onto the battlefield blocking that creature. It won't trigger if the creature becomes blocked by an effect rather than a creature.Wording changed509.5dDetails
An ability that reads "Whenever [a creature] becomes blocked by a creature, . . ." triggers once for each creature that blocks the
namedspecified creature. It triggers if a creature is declared as a blocker for the attacking creature. It will also trigger if an effect causes a creature to block the attacking creature, but only if it wasn't already blocking that attacking creature at that time. In addition, it will trigger if a creature is put onto the battlefield blocking that creature. It won't trigger if the creature becomes blocked by an effect rather than a creature.Renumbered
509.5d→ 509.3dDetailsPreviously
5. Turn Structure
509. Declare Blockers StepThen
5. Turn Structure
509. Declare Blockers StepAn ability that reads “Whenever [a creature] becomes blocked by a creature, . . .” triggers once for each creature that blocks the specified creature. It triggers if a creature is declared as a blocker for the attacking creature. It will also trigger if an effect causes a creature to block the attacking creature, but only if it wasn’t already blocking that attacking creature at that time. In addition, it will trigger if a creature is put onto the battlefield blocking that creature. It won’t trigger if the creature becomes blocked by an effect rather than a creature.