Like most Magic: The Gathering cards, the value of Epic Confrontation 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 (Dragons of Tarkir)
Some, like Jakub Slemrs 97 deck, come as low as $80 on TCGPlayer (sorry, Jakub)
However, the new announcement still features several interesting cards and hints at potentially game-changing combinations that are likely to catch the attention of many Pokemon TCG Pocket fans
Ignoring Market Changes: Dont rely on what you paid for the card years ago, as the market changes constantly
For example, if you have five permanents with time counters, you could add a time counter to one permanent, remove a time counter from a second permanent, and leave the three other permanents untouched