This Japanese-only product is only sold at participating FamilyMart convenience stores
Whenever Ursula, Deceiver of All is used to sing a song - Lorcanas action cards that can be played for free by exerting a character equal to or greater than the songs ink cost - the song can be played again from the players discard pile for free, then returned to the bottom of their deck
Della Duck has a cool name and decent artwork, but shes not exactly overpowered
Most cubes don't bother with this as it is a tribal card and requires support to perform

Ifrit Suplex Thunder Magic Triple Triad Unexpected Request Vaan, Street Thief Warrior's Sword Zell Dincht Airship Crash Ancient Adamantoise Balamb T-Rexaur Bard's Bow Bartz and Boko Blitzball Shot Cactuar Chocobo Kick Chocobo Racetrack Clash of the Eikons Coliseum Behemoth Commune with Beavers Diamond Weapon The Earth Crystal Summon: Esper Maduin (Esper Origins // Summon: Esper Maduin) Esper Origins (Esper Origins // Summon: Esper Maduin) Galuf's Final Act Gigantoad Goobbue Gardener Gran Pulse Ochu Gysahl Greens Jumbo Cactuar Loporrit Scout Prishe's Wanderings Quina, Qu Gourmet Reach the Horizon A Realm Reborn Ride the Shoopuf Rydia's Return Sazh Katzroy Sazh's Chocobo Black Chocobo (Sidequest: Raise a Chocobo // Black Chocobo) Sidequest: Raise a Chocobo (Sidequest: Raise a Chocobo // Black Chocobo) Summon: Fat Chocobo Summon: Fenrir Summon: Titan Summoner's Grimoire Tifa Lockhart Tifa's Limit Break Torgal, A Fine Hound Town Greeter Traveling Chocobo Vanille, Cheerful l'Cie Absolute Virtue Balthier and Fran Black Waltz No

It changes the math of each turn enough that it requires some double-checking and re-evaluation, which can be a little frustrating for a new player who is still trying to figure out what their cards do