What is the estimated price of a tarot card?

Let us say, one is trying to get a specific tarot card (not just any) from vault fights. If we take the pricings, the developers tend to set for ingame contents and transfer them to the average amount of vault keys necessary, where would you roughly say, does the price of that troop end up (I am aware, that the number will keep growing as long as new tarot and now additionally upcoming kingdom troops are introduced)?
Under 100$? 100-1k? 1k-10k? More?