Bucky is an uncommon from Rise of the Floodborn that had been giving an unbalancing advantage to Emerald decks since the release of Ursula's Return. The context for this errata was explained as follows by Ravensburger designers:
"Ursula’s Return gave Bucky players the opportunity to discard multiple cards from opponents’ hands as early as turn 2 while building up a board that was very difficult to interact with, creating a stressful environment that just wasn’t fun. Ward also made Bucky close to untouchable, taking away player agency to deal with a powerful and cheap threat. For these reasons, we’re increasing Bucky’s cost to 3 and removing Ward from him. Additionally, we feel that requiring Shift better represents the Floodborn experience, as many decks utilizing Bucky have mostly ignored using the Shift mechanic (outside of one sinister bird)."
Furthermore, the Disney Lorcana Organized Play Team apologized for "missing the mark" with this card. The new Shimmering Skies set will hit stores on August 30, 2024 (see "Fifth 'Disney Lorcana' Set").