You can find out if your Pokmon cards are worth money by checking set info, card condition, rarity symbols, and recently sold listings on eBay or TCGPlayer .
Having the uncommons and commons mixed in with either of those last slots means you get some terrible odds
Alongside a card like Impact Tremors, this easily ends the game
This was one of my favorite cards when I played Yennett, Cryptic Sovereign, and its one of my favorite cards in this deck
for this reason, when the target card is a basic, the calculations to find the probability are slightly different
If your primary concern is constructed play (where you build your decks from your own card pool), you have to make a decision about what you are trying to accomplish