Can anyone please explain what the differences are between the reason they have a block format and the reason they have an unlimited format? I mean, of course, they were both made to stop people from abusing certain cards but why are there 2 formats? Is it because some tournaments use one format over the other? I mean, i'm not going to any tournaments anytime soon, but I want to play the game by creating decks that would be legal if the time ever came. Also, a sense of playing fair by avoiding overused or broken cards is another reason I wanna follow the format. But if there's two formats, each with different limits, I don't know which to follow, unlike, for example, Yu-gi-oh, which has 1 list of banned cards, limited cards, and semi-limited cards, making it simple to follow the correct format if you want to truly play the game fairly.