The easiest way to determine if your deck belongs in bracket four or five is that four is an optimized commander deck, while five is a deck you would bring to a tournament with the intention to win
Elsa, Spirit of Winter : Around $700 Stitch, Carefree Surfer : Around $200 Tinker Bell, Giant Fairy : Around $280 Mickey Mouse, Wayward Sorcerer : Around $300 Belle, Strange but Special : Around $285 Aurora, Draming Guardian : Around $245 Aladdin, Heroic Outlaw : Around $200 Hades, King of Olympus : Around $200 Genie, On the Job : Around $190 Simba, Returned King : Around $220 Mickey Mouse, Artful Rogue : Around $185 Maui, Hero to All : Around $200 Additional Enchantment rarity cards are coming with the second Disney Lorcana set, Rise of the Floodborn
For one mana more than a Relentless Assault, you can retrace it
TCG: Legendary 5Ds Decks
Having higher counts of your important cards decreases your chance of Whiffing or failing to draw intoa critical card when trying to draw into it