Hypothetical response. I would imagine Unicorn Chomper would be in the 10+ million coins or even higher. Just by comparison, an ability is about half a million coins, then for a sought after, beyond legendary character, it would be very high. The Uni chomper is beyond rare, legendary, category. Even though it is not super strong, but its uniqueness intrigues those who are purist and for serious gamers who seek to complete the sticker book.
Disco, Torch and goat would be in the low million coins. They are not special characters.
Just my 2 cents.
