Well, it gives you different options than a normal Lost Zone Box deck, and plays out like a different version of Giratina VSTAR
This is all thanks to it providing a steady stream of ramp through playing additional land
There's also no way to play with them once they're finished, so they're very much a collector's piece
We also have plenty of "size matters" payoffs like drawing silly amounts of cards off Return of the Wildspeaker, ramping out all the lands with Traverse the Outlands, devouring entire armies with Monstrous Onslaught, and flooding the board with creatures with Scepter of Celebration
They are definitely a fun set to collect with the unique Halloween-themed symbol and spooky collection of Pokemon (and Pikachu!)
So, you need to keep your eye on the current card trend and also analyze other sellers before you fix a price for your own stock