These promos are part of a long tradition of silver-bordered promos, like the annual holiday card, that Wizards uses as a way to make fun cards that otherwise wouldnt make sense in the Magic universe or within Magics rules
In a format where powerful creatures are commonplace, being able to exile a creature is a significant advantage
And of course, only big collector's will want the Black Belt promos (as it's player bulk, and I can't imagine the average collector will care), and a larger market will want the Professor's but I speculate no more than a few dollars a piece on those at release, if that
However, getting more opportunities to play Tragic Hero sooner can help you with card advantage in the early game, as your opponent might not have much to answer Tragic Hero before turn 4-5 without losing board tempo
This is great insurance, as losing your board to Westvale Abbey only to lose Ormendahl to removal always feels rough