If you don't have access to Squall, you'll have to use your suite of control cards to slow your opponents down until you can cast Squall.
Of course, just being granted an enchanted version of a card does not guarantee that the card is going to be strong or even frequently used
(Amethyst) Elsa, Gloves Off (Amethyst) Gaston, Intellectual Powerhouse (Sapphire) Cogsworth, Talking Clock (Sapphire) Cogsworth, Grandfather Clock (Sapphire) Belle, Hidden Archer (Emerald) Bounce (Emerald) Hypnotize (Emerald) Panic, Underworld Imp (Emerald) Bucky, Squirrel Squeak Tutor (Emerald) Cinderella, Stouthearted (Steel) Cinderella, Knight In Training (Steel) The Prince, Never Gives Up (Steel) Tiana, Celebrating Prince (Steel) Robin Hood, Capable Fighter (Steel) Dinner Bell (Ruby) Raya, Warrior of Kumandra (Ruby) Mulan, Soldier in Training (Ruby) Rise of the Floodborn will have over 200 cards, however, so this list will continue to grow as the set gets closer to its official release date
Then there's Abuela Alma, who enables you to go digging through your deck for a Madrigal character, which further cements the predictability of the deck key in a tournament setting