I'm generally anti-UB with an exception for when the set really feels like medieval fantasy
With Pixie, you can even do the latter then switch to the former later, as the game progresses
Customization options are extensive and can include bespoke artwork, various card stock weights (e.g., 300gsm, 350gsm with black core), specialized finishes like holographic effects (e.g., rainbow, starlight), foil stamping (gold, silver, colored), embossing, spot UV, different card sizes and shapes, custom packaging (tuck boxes, rigid boxes), and anti-counterfeiting features
Of course, Phage has inspired all sorts of nonsense and trickery
This ability can't be copied and X can't be 0
This immediately makes Shang-Chi a great pairing with cards like Enduring Vitality for quick mana, or Commanders that rely on activated abilities like Baba Lysaga, Night Witch