Through the Dark Portal

During your turn, pay (13) to complete this quest. Reward: Remove your deck and graveyard from the game. Build a new ten-card deck using cards from your entire collection.

Rules note: In a tournament, your collection is your side deck, so your side deck becomes your new deck as this effect resolves. In casual play, your collection includes all cards in your possession, but excludes the cards with which you started the current game. To build a new deck, you must keep the same hero and follow the usual deckbuilding rules. You can include up to four copies of each non-unlimited card in your new deck, even if the deck with which you started the current game contained four copies of that card. As the last part of resolving this effect, shuffle your new deck.