Get a "Gold" in the following drills in mini-camp mode to unlock the 
corresponding card:

#3: All-Madden Chase and Tackle 
#16: All-Madden Pocket Presence 
#28: All-Madden Coffin Corner 
#36: All-Madden Ground Attack 
#40: All-Madden Precision Passing 
#52: All-Madden Swat Ball 
#58: All-Madden Clutch Kicking 
#96: All-Madden Trench Fight 
#194: Chase and Tackle 
#195: Ground Attack 
#197: Clutch Kicking 
#199: Swat Ball 
#208: Pocket Presence 
#209: Trench Fight 
#210: Precision Passing 
#211: Coffin Corner