Functioning atypically to a board wipe, however, after all creatures are destroyed, you select one creature from any graveyard and put it onto the battlefield under your control
In any Booster Draft format, whether its for Disney Lorcana or Magic: The Gathering, players build their decks as part of each game by opening a set of booster packs (giving the format its name!) This is the formats biggest difference from other constructed formats where players are able to build their deck ahead of time
It can feel silly to tell the person in charge of balance that "Yes, this number really does need to be 9,999." I get to sit near Michael nowadays, and it's always fun to watch him keep a bemused smile as another set lead asks him to evaluate something as crazy as a Jumbo Cactuar
Be aware, however, that Diancie does not protect against cards like Escape Rope