Talk:S Booster Set 2: Dimension Destroyer/@comment-36038725-20180718075437/@comment-1755882-20180718113739

You were informed incorrectly, main sets have always been four worlds.

The reason for the main character decks getting consistent support is actually rather simple; Buddyfight's primary audience if rather young kids in Japan, kids young enough that their parents will be buying random packs for them. Therefore, all sets that have packs at the normal price point or lower will have the main character world (or as of Ace, Worlds).

The Ultimate Boosters circumvent this issue by being more expensive (almost twice as much) so its pretty unlikely parents will accidentally buy them.

Most of the time (outside of freak accidents like what happened with X) this support is designed in such a way that it isn't overpowering, or new attributes within those Worlds (like the new Blood Dragons in Dragon World) are made to diversify that support.