The difference is that while they have an ink cost on them, there is also an extra block of text in the description area of the card which details that you can exert a character (turning them sideways and opening them to attack) of a minimum cost in order to play the song card for free
At the time of writing, TCGPlayer shows an estimated market value for the Enchanted card 220/204 at $181.47 USD
While the stock, budget, and mid-cost version of this deck all relied on King of Hearts to lock down exerted characters, the sad truth is that King of Hearts is a weak, over-priced, and under-statted character
Cards like Michelangelo, Improviser use sneak to enter combat tapped and attacking, while spells such as Shredders Technique and The Last Ronins Technique can be deployed mid-combat for discounted costs, turning what looks like a safe block into a blowout
Can you play Disney Lorcana with more than 2 players