While it has almost the exact same stats as Marill, what makes a difference is what it eventually becomes
Pro tips : The SM Lost Thunder # 157/214 Smeargle appears in both regular and reverse holo and has become scarce on marketplaces since the 2018 Sun & Moon era
But wow, thats just so strong and cool, and you should play it
Full Arts of this era will use a green linework, continuing the theme of different eras using a single line color for this card type (Gold for XY , Blue in Sun & Moon with Red for Ultra Beasts, and Silver for Sword & Shield )
A colorless source of fixing is a nice thing to have around, and this format has enough multicolored stuff going on that solving this isnt impossible, and obviously the Case itself increases your chances of having a deck that lets you solve this, but I still think this will be hard enough to solve that most of the value just comes from its ability to fix your mana, with some occasional late-game upside