Technically, the most expensive Disney Lorcana card right now is the promotional Golden Mickey Mouse Brave Little Tailor that is being given as a prize for top placement in official tournaments
This is optional, which means if you have some way of recurring your action cards from your discard, which emerald is very good at doing, then you dont have to take the benefit
This super rare Mickey has a similar recycle effect, but only for your Broom characters
From the Rise of the Floodborn expansion, this version of the card evokes the classic Disney animation feel with the bright gold and silver artwork
Once a character has been on the board for a turn, you can perform actions with them, either challenging an opponent's character or questing to gain lore
Its not difficult at all to engineer scenarios where this draws you four cards a turn cycle, which is great by anyones standards