"We're seeing the people that would buy trainers and stuff, to flip for profit, now coming over to Pokmon to do the same thing." Suddenly, the reason why one person might be going into a store and buying up the entire stock started to make more sense: They're immediately in profit
The announcement page does mention that the card may be reprinted at a later date for other Pokmon TCG-related products, as well as for additional promos in the future
The other decks that utilize the devotion mechanic can be strong as well, but they hinge on having access to Nykthos, Shrine to Nyx, whereas Mono-Blue Devotion doesnt need that card to go bananas
another popular card was Force of Will
There's something to be said about never having to ink a card from your hand again, which is why the Legendary variant we mentioned earlier is also spiking at decent value since launch (sitting at around $26), but the Iconic rare is just on another planet