They were published in Japan by Media Factory and developed by Creatures Inc., working alongside the core Pokemon companies tied to the franchise (Nintendo, Game Freak, and Creatures)
If you slam Excruciator as though it were a Scapeshift (that is, an expensive spell with taxing deckbuilding constraints that rewards you with a one-card win condition) rather than a Splinter Twin (a combo piece where you need to assemble two pieces to win the game) you will win a lot more than you will lose
Delcatty (PT4): The recommendation is to team Delcatty with Nidoking (RR29)
Last but not least, Wizards of the Coast is also changing up their Standard philosophy somewhat
Witherbloom Pestilence It shouldnt be too shocking that Pests are making a return in the Golgari Witherbloom Pestilence precon, featuring Dina, Essence Brewer leading the charge
Most of the legends matter stuff is on a handful of underperforming rares though (i.e., Clive's Hideaway, Serah Farron), so dont expect to build around legends specifically