Oracle Text

Target blocking creature gets +7/+7 until end of turn.

Card Rulings

10/1/2009 A “blocking creature” is one that has been declared as a blocker this combat, or one that was put onto the battlefield blocking this combat. Unless that creature leaves combat, it continues to be a blocking creature through the end of combat step, even if the creature or creatures it was blocking are no longer on the battlefield or have otherwise left combat.