The Captain America Card Collection is a vintage card collection featuring Captain America.
S.H.I.E.L.D. Agent Phil Coulson spent several years collecting a set of vintage Captain America trading cards from the World War II era. Upon meeting Steve Rogers after his revival, Coulson asked Rogers if he would be willing to sign the collection. Rogers responded that he would, but before he could Coulson was killed by Loki prior to the Battle of New York.
After Coulson's death, S.H.I.E.L.D director Nick Fury took the cards out of Coulson's locker and smeared them in Coulson's blood in order to motivate Rogers and Tony Stark into action against Loki. When confronted about the action later by Maria Hill, Fury would reply that "They needed the push".