You only need one Gardevoir ex on your Bench, but you'll want as many Ralts as possible and a Drifloon in the active spot if it's safe
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Other ideas that were too pricey for the deck include Defense of the Heart, Dust Bowl, Strip Mine, Pernicious Deed, Oblivion Stone, Expedition Map, Mirrorpool, Traverse the Ulvenwald, Attrition, and maybe Primeval Bounty
(A Basic Pokmon is considered a Pokmon with Basic as the Pokmons Evolution Stage.) Next, add Energy cards that match the Energy types of your Pokmon
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An immediate factor that can make your cards worth something is if you get that Alternate Artwork