League play is generally unlimited, however, you may find that there are a number of people that choose to only play modified because they are gearing up for the tournament season or tournament coming up during the season
me personally, I decided to leave unlimited play alone, it serve no real purpose except to just play a fun game...which there is nothing wrong with that, but for me if I want to play a fun game, I will go back to my old games of choice: DBZ/GT & Epic Battles
I guess what I'm saying, is that being I am buying cards and such, I want them to account for something, not just the prestige to say I have "such-n-such" card(s)