In theory, Astarions Thirst is a crossover, albeit without the Universes Beyond security stamp, which increases potential demand
In fact, its been performing considerably well in the Japanese competitive scene and has the potential to counter some top decks in the current meta
These include: Command Performance from Unfinity Kozilek's Command from Modern Horizons 3 Verdant Command from Modern Horizons 2 Six different versions of Very Cryptic Command, all from Unstable Original Lorwyn Commands Magic's original commands came from Lorwyn , which introduced the template and included mono-colored versions, one for each color
There is a lot of searchability in the deck for consistency
WC I know that both Panini and Topps have gone to short-printing some products
Mims are simply the most popular ways of activating them, but cards like Bounce or Bibbidi Bobbidi Boo could see play in those slots if the Mims ever found a reason to fall out of favor