Because the cards in this set ('Mickey Mouse, Friendly Face,' 'Elsa, Gloves Off,' 'Genie, Powers Unleashed,' 'Stitch, Abomination,' 'Maleficent, Uninvited,' and 'Maui, Demigod') don't change the original rules, you can use them as a part of your existing decks
Did you say three
Elsa, Snow Queen D23 Promo, 3 Another of the infamous D23 cards, just like the rest of the set, Elsa, Snow Queen was one of the first Lorcana cards ever publicly released, predating the retail launch of the game by several months
The power of each card is determined by the strength and willpower scores printed on them, and if you defeat your rival on a quest along the way, you get to move closer to 20 by the number of lore that card holds
The end result was a big surge of demand and huge price spike for what was suddenly deemed an undervalued card and that was almost $2,000 to begin with