Given its in-game usefulness and strength, along with its amazing card art, its no wonder we see Greninja ex at the top of the most valuable Twilight Masquerade cards list
Apart from lands, ramp, draw, and removal, I would make the other categories "enablers" for cards like Awakening Zone and "payoffs" for cards like Dictate of Erebos You might notice you're not running too many ways to generate enough tokens and a tad too many sac outlets or payoffs that aren't triggering often enough.
Employee-Only Distribution Estimates suggest only 30-60 copies exist
In other words, it has to be something that would work with Panharmonicon or must be a trigger that could be targeted by a Stifle
Graded 9 by PSA, the card is in mint condition
If you do, search your library for a Dragon creature card, put it onto the battlefield, then shuffle