To unlock Cards, win the corresponding challenge:

Myung Bo Hong: AFC World Cup qualification
Francesco Totti: UEFA World Cup qualification
Roberto Carlos: CONMEBOL World Cup qualification
Ruud Van Nistelrooy: CONCACAF World Cup qualification
Nuno Gomez: EFA
Iker Casillas: European Championship Cup
Thierry Henry: European Championship
Henrik Larsson: Copa America
Thomasz Rodzinski: Gold Cup
Steve Marlet: FIFA Confederations