At the risk of sounding obnoxious, the only reference point you need here is the main plot device of the Dragonball series: collect 7 balls > get a wish.

I’m asking sincerely, not rhetorically: is this niche cultural knowledge? In my mind it’s like understanding the point of pokemon is capturing animals in balls, or that P. Sherman lives at 42 Wallaby Way, Sydney. Harry Potter is a wizard.