To build a deck, go back into the Deck section
However, when an adult (I generally just don't deal with minors unless a parent is present) posts a Craigslist ad asking for X dollars for their collection, I never feel bad paying the asking price, even if their cards are worth more

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Weakness: Fighting (x2) Resistance: none Retreat: 4 #115 Shaymin Colorless HP70 Basic Pokemon [C] Gather Flowers: Search your discard pile for up to 2 Energy cards, reveal them, and put them in your hand