Eevee is everywhere, so most Eevee cards are common — but a handful are genuinely valuable thanks to the Eeveelution craze. Here's the breakdown.
The ones that hold value
The strongest is the Prismatic Evolutions Eevee SIR, with the Evolving Skies special art and select promos behind it.
Nice to own, not investments
The vast majority of Eevee cards — common holos, countless promos, recent bulk — are affordable and great for collecting, but won't appreciate. Eevee's value is mostly in its evolutions.
Where the real Eeveelution value is
If you want value, the evolutions carry it: Umbreon (Moonbreon), Espeon Gold Star, and the Prismatic SIRs. See the full Eeveelution ranking. To grade, run the grading calculator; to sell, see where to sell.