While Card Kingdom 's pricing should give a pretty good idea of how much you'd have to pay if you wanted to buy the cards on the open market, the downside to this methodology is that it likely over-estimates how much you can sell your cards for because as an individual, you're likely not going to be able to get as much as a professional vendor can
You can use that Item Card to attach up to two Energy cards of different types and attach them to your Pokemon in any way you like freely - as long as you have 7 or more cards in your Lost Zone
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Oversize or jumbo cards will be refused
It lies somewhere in high casual, playing some pretty powerful cards like Ragavan, Nimble Pilferer, Smothering Tithe, and a pumped-up mana base compared to the precon
It's an ideal pick for players who like balancing risk and reward and to feel a little bit stressed out along the way