First, we've got Trial // Error, a split card that combined has Esper colors, that is, until you realize it doesn't have the fuse keyword that would let you cast both parts of it
The easiest way to do this is to examine the card under a good source of light
Its popular because its still exciting to pull an unassuming Litwick if the art is nice enough and the card seems fun to throw into a deck and if you can sell an almost-30, heavily jaded arse like me on anything less than a golden secret rare, imagine how that kid trick or treating is going to feel.
There is certainly room for upgrades within each deck, and you don't need to forage too far to really beef them up
Because that level of perfection is incredibly rare, especially for vintage cards that have survived for decades
I've tried to take this into consideration