Merchants allow you to store up to five cards in your Market when you build a deck. When cards are retrieved from a Market, they are drawn.
The Market is a zone mechanic and its associated keyword, similar to the sideboard used in many card games. The five cards in your Market are not drawn normally, instead they are interacted with by Merchants to give you flexibility in deckbuilding. Your opponent cannot see your Market.
The Market Zone Edit
The Market is a zone separate from your deck, hand and void, so cards and abilities that would affect those zones (such as Warcry) do not affect cards in the Market.  Cards swapped into your Market during gameplay may be swapped back out later in the game. They remain in your Market until interacted with or the game ends. If a temporary card (such as one of the copies from Bore's effect) is added to your Market, it will remain there (even if it was supposed to be discarded).
Using the Market Edit
Currently Merchants are the only cards that can interact with a Market. All Merchants have a Summon ability that allows you to swap one card from your hand with a card in the Market that shares a faction with the Merchant.
- See Category:Merchant for all the Merchant card pages.
Building a Market Edit
Markets only appear in deck construction when you add a Merchant to your deck. The Market appears as a separate tab in the deckbuilder's standard layout, while collection cards added the Market have the Market icon above them. Market cards appear at the end of the decklist in the advanced deckbuilder view. You can at most four copies of any non-Sigil card between your Market and your deck. When adding a Merchant to a Draft deck you may only add other drafted cards to your Market. Merchants do not appear in Forge mode.
The Black Market Edit
A Black Market is a Market that can't contain any of the same cards as your starting deck.
Defiance introduced the Black Market, along with five new Merchants. These "Smugglers" are all 2-faction units, individually able to swap for a greater variety of cards than the previous Merchants.
The single-faction units can still interact with cards in a Black Market.
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Power cards in the Market are considered to be in the factions of the influence they create. Multi-faction cards can be swapped by any Merchant of any of their factions.