Use Madden Cards indefinitely:

You must have a profile made or loaded.Do the training mode in the Coaches Corner.

Here you earn "tokens",used as points Whenever you complete a certain play, you earn tokens.

Do every play that the game gives you.Try to do them correctly so you can earn as many tokens as posible.

When you have complete each play, you can earn no more tokens.

Save your stats in the profile.Then go to the Madden card selection under the challenge Status section(should be in middle)
In here you can buy cards,just like baseball trading cards.
Cards are bought in packs.Every card has a player
(boots stats by certain precent), vetran player that you can sign to your roster, Super Bowl teams(for example the 73' Steelers, created team,new staduim,cheerleader cards,and cheat cards.

The cheat cards and cheats,just like in Madden 2000 or 2001
(and some New cheats.You can buy cards with the tokens you have just earned.

Almost every card can normally only be used once. Save the profile after you have all the cards you want.

You can activate all the cards, you want.You can activate all the cards you want and after the game most of them will be gone However they will only remain gone if you save your profile after
the game.

First save the game but do not save the profile.
Restart the game. Start the game again and load the profile.

Then select Madden Cards:Activate.If done correctly, all of your cards should be back to the amount that they were.

Do this after every game and you should be able to use the cards.