I used to play this game when it was made by Score(who cash grabbed every toonami franchise they could) and it was a fun game while it lasted. Of course like all Score games they killed it after milking what they could out of it.
Some fans decided to bring the game back a while ago and have made a totally free place to play dragon ball z online:
A couple of the rules are different from Score's but nothing that will make you have to change things drastically if you played the old game. All the cards are downloadable so no worrying about pack grinding. You just get the cards and go.