Outer Deck

The Impure Deck ( イムピュル デッキ in the OCG version ) is a Deck Zone introduced in Structure Deck S: Revival of Hiro. As the name suggests, it is where Impure Monsters are stored.

Much like the Extra and Side Decks, there is a 15-card limit to how many cards are placed in the Impure Deck. How many cards are in the deck is public knowledge but only the player who possesses it can look through it at any time. As per other Decks during construction, the "Maximum of 3" rule applies for the Impure Deck.

If an Impure Monster should ever be returned to the hand or Main Deck, it will be moved to the Impure Deck instead.

As per the Master Rule 4, because a Summon from the Impure Deck is not from the Extra Deck, Impure Monsters Summoned from the Impure Deck are Special Summoned to the Main Monster Zone, and cannot exist in the Extra Monster Zone by any means.

Placement on a play mat
Formerly, the Impure Deck Zone was located to the left of the blue Pendulum Zone. As of Starter Deck D-ZERO 2017 Q2, it has been moved to being directly above the Field Zone turned sideways.