Dialga is an excellent example of this, boasting valuable cards hailing from sets across eras, including some expensive Diamond and Pearl era sets. Leafeon's best cards are rolling up the charts.

Palkia and Dialga are the two mascots of Time-Space Smackdown, but which is the stronger card? Palkia ex is the ... your deck totally bricks, so which print you use doesn't make a lot of difference.