Due to the high number of EtB and upon death triggers in cube Nightmare is pretty much endless value
Not only does it expand the possibilities of deck building by giving access to your sideboard cards at all times, but it does so while also putting an interesting restriction on the cards that you choose for your sideboard
Still, they seem to have shown no intention of doing anything with this so far either
Since the cards made their way into American and European markets, several threads on the r/PokemonInvesting subreddit have popped up discussing the Full Art Rare Gumshoos suddenly spiking in price, including one thread titled Thoughts on the Donald Trump card? As another thread in the same subreddit explains, the card seems to be exploding in price overnight, with some sellers on TCGPlayer listing the card for upwards of $100
Attack 1: [W] Bubble (10)
Try to decipher whether is likely they have a Chainwhirler in their hand or not as act accordingly