Like most Magic: The Gathering cards, the value of Snap depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Secret Lair Drop)
So many players have done so that decks that run The OracleThe Oracle are mainly higher power lists
Sure, chances are pretty low of pulling an Umbreon ex special illustration rare, but will that stop you from trying to find it
Legacy of the Duelist and Tag Force Arc-V Special are OK, but since they're not time bound to the specific era I'm building for and include modern cards those older characters would have had no access to, I generally prefer the GX era World Championship games and what I consider the golden standard, the first 3 Tag Force games
Wild Mongrel looks normal to modern viewers, but it was anything but
Unless an opponent's deck has a high mana curve, choosing either two or three seems to make the most statistical sense