You can now trade cards with other players. Offer a card on the public market or to a friend and name the card you want in return. Both cards must have the same rarity.
Each trade costs Moondust: 10 for a Common, 20 for an Uncommon, 50 for a Rare, 120 for an Epic and 300 for a Legendary. You get Moondust by grinding spare copies in your collection: 5, 10, 25, 60 or 150 per card, by rarity. You can only grind copies you cannot use anyway, so you always keep 2 of a card and 1 of a Legendary.
You can make three trades a day. An offer stays open for seven days.
Card trading online, step by step
Card trading online in Shardmoon has four tabs. Market shows the open offers of other players, For you shows offers that friends sent to you, My offers lists your own, and New offer starts one. Pick the card you give and the card you want, choose the market or a friend, and confirm. Both players pay the Moondust for the trade, and the server checks every step. A Gold copy keeps its history when you trade it: who found or forged it, its wins and its owners.
Trading works best together with grinding: turn the copies you cannot play into Moondust, then trade for the cards your deck is missing. Read more about collecting in the free online trading card game overview.