from Marketplace sales,
First of all, take a look at how many of these exact same cards are being sold — that’s a red banner in the upper right corner. Your chances of making a profit decrease with every other person selling the same item as you. Watch the Marketplace closely and try to only put out the cards with fewer offers. that way you can tell what you can buy and sell in the market to make profit. thank me later.
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From @lanzery