I'm fairly new to the game. When buyin cards I picked up a championship deck from '08. Im wondering if i can use the cards in legal tourny play even they have different backs(i have sleeves to cover that up) and grey borders? I was reading rules online and it seems cool just as long as the tourny doesnt specify that those cards cant be used.Wondering if its a general thing or specific tournys i cannot use them in. Thanks in advance for the responses.