Handsome Devil is very cheap. For some reason, it is not in demand although the card is not bad. If Deception Nether tribe is stronger one day and gets synergies, more cards like this
the price may grow much. (although Handsome Devil is common and this is not so good).
Lurker and Shackled Acolyte are and will be best-sellers...
All prices will grow...
I buy cheap cards sometimes... Just for pleasure of shopping :)