He's payoff and engine both for the popular spell-slinging archetype and even has a few easy infinite combos - and he's not the only Final Fantasy card that can be broken this way
Lorcana references are property of Disney.
Summary Ursula's Return introduces Sing Together mechanic & new Enchanted card Anna, True-Hearted, to deepen gameplay
It wasnt quite as popular, due to the fact that the same card appeared in the set as an actual Enchanted, and it was only played in niche Amethyst/Emerald decks - and only one or two copies at that
You'll want to keep him as safe as possible with Bodyguards, Locations, and characters that grant him Ward or Evasive because if your opponent can't get rid of him quickly, you can run away with the game.

Early Check-In (day before event) Flotsam & Jetsam Entangling Eels Event Promo Participation Dragon Fire Challenge Promo (Must play a minimum of 3 rounds) Swiss Performance (Roughly Top 128) Let It Go Challenge Promo Top 64 Players (Top Cut) Cinderella Stouthearted Challenge Promo Top 32 Players Rapunzel Gifted with Healing Challenge Promo Top 16 Players Rapunzel Playmat + Qualify for North American or European Championship (matching Challenge events respective region) Top 8 Players Serialized Gold Mickey Mouse Brave Little Tailor Top 4 Players 2 Displays of Current Set + 25 Prize Wall Tickets Top 2 Players 2 Displays of Current Set + 25 Prize Wall Tickets Winner Challenge Trophy + Full Foil Set of Current Challenge Legal Set (Including Enchanted Cards) Everyone who gets the same point total at place 128 will get a Let It Go Challenge Promo, so there wont be some that dont due to ties