Look for whitening on edges, surface scratches, print lines, and how centered the artwork is within the borders
Commit is an awesome one that comes to mind thats already in a lot of Cubes
The back side isnt bad, although its not game breaking-either
It is also a series in which Konami composer Sota Fujimori participated with perfect attendance
The thinking is that Polukranos is your biggest investment with the least immediate payoff, but Im not sure that cutting a big threat is better than just cutting another Satyr
I only have one copy, so I dont think anything definitive can be said about it yet, but I think youre indeed right that they follow a similar print run as Shadowless for all Ghost stamp Pikachu - even though it IS a different print run, since otherwise they wouldnt have had those Ghost stamps in the first place