Premade Decks are packs that add 20 cards to the player's collection when bought. Unlike boosters, premade decks always give the same cards, and players can choose to preview the deck before they buy it. If no sales are active, premade decks cost 100 Dragon Coins.
Premade decks are not an ideal way to spend dragon coins. The cards in premade decks are not hard to obtain except the one shown in the bottom right corner of the preview. Drafting is a cheaper option, and the rewards may include crafting materials, or even legendary cards.
As of May 22nd, 2012, premade decks are no longer purchasable.
These four cost 100 Dragon Coins each: