cards worth money generally fall into a few key categories: tournament prize cards, early promotional cards, limited event exclusives, and high-grade vintage prints
What makes a Pokmon card good: It needs to able to stand on its own alone Think about the following scenario
Leafeon ex Special Illustration Rare, 144/131 Another beautifully illustrated card (in a list thats nothing but cards with fantastic, genuinely impressive artwork), Leafeon ex features the Grass type Eeveelution
It blanks single-target removal, stops Fireballs aimed at your face, and leaves you up a small Zombie Army
1 Heliod, the Radiant Dawn
Magus of the Scroll 1 Printing and its Price Track Magus of the Scroll Prices Free collection tools for Magic: the Gathering