the most expensive pokemon card Pokémon From Every Year 5 Most Expensive Pokemon Cards
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The other big bonus was that you got to see their entire deck, which back then taught you a lot more than it does now due to a lot of people playing their own homebrews and a lack of other ways to take a look
But neither card can match the absurdity of Natural Order, which, for the low, low cost of four mana and sacrificing a green creature, lets you put the best green creature from your deck directly on the battlefield, which often means your opponent staring down a Progenitus or a Craterhoof Behemoth as early as Turn 2 or 3, which is pretty wild
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Serious collectors know these cases retail for several dollars each

Aside from that, the cards from the 99 that are more standalone cards are potent, too