Players can still use them in casual matches, but Lysandre's Trump Card disrupted competitive Pokmon play so badly that it was removed from legal use altogether
Another problem with Big Man Down is that it does something that often might have zero impact on the game
4 Espeon [Daisuki Club] Japanese Promo Card Estimated Value: Recent sales are anywhere between $6,400.00 and $14,000.00 (gradings vary) This card is very rare and almost impossible to pick up
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
This is great insurance, as losing your board to Westvale Abbey only to lose Ormendahl to removal always feels rough
In a format where powerful creatures are commonplace, being able to exile a creature is a significant advantage