The combination of textured SARs, exclusive MUR/MA/BWR rarities, guaranteed SR pulls per box, and earlier release dates makes Japanese the preferred format worldwide
The other thing is whether or not youre attached to it
Those metrics aren't irrelevant for these drops, but they're certainly less important when you're talking about raising money for children
I think those are usually two-handed weapons
The first is simply rarity: some cards are printed much less than others, perhaps with even rarer art or foiling that makes them highly desirable
Historically, Cabal Therapy has paired with other discard spells and Gitaxian Probe so you have a better chance of getting a look at the opponents hand before casting it, but for Cabal Therapist thats another layer of setup and another deckbuidling restriction for a card that clearly wants to be paired with a high density of creatures or token generators so you can fuel the ability turn after turn to force your opponent to spew their spells quickly or lose them