Stay Updated with New Sets New MTG sets often come with beautiful card designs
Aside from one exception in the Sword & Shield era of the Pokemon TCG (Dark Sylveon V, to be exact), the most recent Dark Pokemon cards at the time of writing are from the early 2000s with the EX Team Rocket Returns expansion set
One could, in theory, utilize Ad Nauseam to simply draw some cards, but let's not kid ourselves
As far as cards that can slot in in other builds, We Ride at Dawn is a great one for Convoke decks, especially because it helps re-cast a Commander but also provides bonus creature tokens to pile into the melee
Scalpers have been buying large quantities of boxes, breaking them open, and reselling individual cards on platforms like eBay for thousands of dollars
Just ask anyone who ever played Urza's Legacy