"The lamps on Wyndmoor Street snuff themselves at midnight and refuse to relight, afraid to illuminate what lies in the darkness."
If you put it onto the battlefield blocking, its ability does not trigger.
509.7. If a creature is put onto the battlefield blocking, its controller chooses which attacking creature it's blocking as it enters the battlefield (unless the effect that put it onto the battlefield specifies what it's blocking), then the active player announces the new creature's placement in the blocked creature's damage assignment order. The relative order among the remaining blocking creatures is unchanged. A creature put onto the battlefield this way is "blocking" but, for the purposes of trigger events and effects, it never "blocked."