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 is, effectively, removed from play and can no longer do anything
They can be played on your turn for their ink cost, and often represent scenes from Disney classics
(Scryfall note) You don't have to choose a target for Wakka's second ability
This set'll also have two more Starter decks: an Emerald/Steel deck featuring Kronk and Scar, and a Ruby/Amethyst one using Ralph and Elsa
// Menace As Braska's Final Aeon's first or second chapter ability resolves, the next opponent in turn order (or, if it's an opponent's turn, that opponent) chooses a card in hand without revealing it, then each other opponent in turn order does the same