black triangle booster box Pokémon TCG Just found this unopened error

PrintingProxies has public reviews and community touchpoints, and their Trustpilot feedback is ok (as with any reviews site, you should read a handful, not just the star rating)

Multi-Choice Effect: An optional effect that can be activated once per turn during its possessor's Main Phase, and allows the activating player to choose which effect to apply among two or more

While Thrill of Possibility will have a hard time replacing Cathartic Reunion in something like Dredge which cares desperately about raw cards in the graveyard, there are graveyard-based archetypes that will absolutely relish the opportunity to start playing at instant speed

Holding up open mana is the oldest trick in the book, and a bluff we all know how to make