They're one of the original 'tribal' creature types: fish folk has been a viable strategy since the very earliest days of Magic: The Gathering

Acclaimed Contender Allied Reinforcements Arthur, Marigold Knight Aryel, Knight of Windgrace Assure // Assemble Assure // Assemble Attended Knight Auriok Steelshaper Azorius Knight-Arbiter Balan, Wandering Knight Banish into Fable Barrow Witches Basri's Lieutenant Battle Menu Benalish Knight Blacklance Paragon Bladewing, Deathless Tyrant Blood-Cursed Knight Bloodsworn Knight Breathless Knight Brimstone Trebuchet Burning-Yard Trainer Cadaverous Knight Call the Bloodline Call the Cavalry Capashen Knight Chivalric Alliance Conclave Cavalier Conclave Guildmage Court of Embereth Craven Knight Crusading Knight Dark Knight's Greatsword Deathless Knight Diamond Knight Dion, Bahamut's Dominant Doom Foretold Dragonsoul Knight Dragoon's Lance Dub Elenda and Azor Errand of Duty Exsanguinator Cavalry Femeref Knight Fervent Champion Fireborn Knight Forth Eorlingas
Ultimately, there's no wrong choice among the Disney Lorcana starter decks, but they aren't equal for every playstyle
Aspect Ratio & Cropping: MTG cards typically use a 5:4 aspect ratio for art, while Sagas use 4:5 (vertical)
While Arcanine ex was lacking during the "Genetic Apex" meta, "Mythical Island" has provided the tools it needs to succeed against many of the newer decks