The Blue Deck is an unlockable deck which provides +1 hand every round. This deck is unlocked by discovering at least 20 items in the collection.
Starting Contents
It contains the 52 cards of a normal deck: four suits, each with 13 cards (2 to 10, Jack, Queen, King and Ace).
Synergies
Starting with 5 hands instead of the default 4, gives two main advantages:
- If this extra hand is unused, it gives $1 more during payout.
- If used, this hand can provide extra score, or be used to find a more favorable hand.
As a sidenote, this almost always makes having +1 hand better than +1 discard (as with 
Red Deck ( {{hl|red|+1}} discard every round Unlocked from start Red Deck.png)), as hands can literally be used like discards, but they give score (and can still be unused to give $1 at payout). The exception is with specific synergies like 
Delayed Gratification (Earn {{Money|2}} per {{hl|orange|discard}} if no discards are used by end of the round Common Economy N/A (Passive) Delayed_Gratification.png) and 
Yorick (This Joker gains {{xmult|1}} every {{hl|orange|23}} {{hl|gray|[23]}} cards discarded<br>{{currently|{{xmult|1}}}} Find this [[Jokers|Joker]] from the [[Spectral Cards|{{hl|sblue|Soul}}]] card. Legendary Multiplicative Mult Mixed Yorick.png).
- Almost all scaling Jokers benefit from having a lot of hands, such as
Green Joker ({{mult|+1}} per hand played <br> {{mult|-1}} per discard <br> {{Currently|{{mult|+0}}}} Common Additive Mult Mixed Green_Joker.png), 
Wee Joker (This Joker gains {{Chips|+8}} when each played {{hl|orange|2}} is scored <br> {{Currently|{{chips|+0}}}} Win a run in {{hl|orange|18}} or fewer rounds Rare Chips Mixed Wee Joker.png), or 
Square Joker (This Joker gains {{Chips|+4}} if played hand has exactly {{hl|orange|4}} cards <br> {{Currently|{{Chips|0}}}} Common Chips Mixed Square_Joker.png), as they can be scaled more.
Troubadour ({{hl|orange|+2}} hand size, <br> {{hl|blue|-1}} hand each round Win {{hl|orange|5}} consecutive rounds by <abbr title="Discards are OK to use.">playing only 1 hand</abbr> Uncommon Effect N/A (Passive) Troubadour.png)'s -1 Hand has less of an effect.
Card Sharp ({{xmult|3}} if played {{hl|orange|poker hand}} has already been played this round Uncommon Multiplicative Mult Independent Card_Sharp.png): The extra hand allows more possible hands to be played with the X3 Mult active.
Loyalty Card ({{xmult|4}} every {{hl|orange|6}} hands played<br>{{hl|grey|5 remaining}} Uncommon Multiplicative Mult Independent Loyalty Card.png) becomes easier to activate.
Space Joker ({{hl|green|1 in 4}} chance to upgrade level of played [[Poker Hands|{{hl|orange|poker hand}}]] Uncommon Effect On Played Space Joker.png): The extra hand gives more opportunities for Space Joker to activate.
Hiker (Every played {{hl|orange|card}} permanently gains {{Chips|+5}} when scored Uncommon Chips On Scored Hiker.png): The extra hand allows more cards to be played and upgraded.
Vagabond (Create a [[Tarot Cards|{{hl|purple|Tarot}}]] card if hand is played with {{Money|4}} or less Rare Effect Independent Vagabond.png): Allows for the generation of 1 more Tarot Card per Blind.
Reserved Parking (Each {{hl|orange|face}} card held in hand has a {{hl|green|1 in 2}} chance to give {{Money|1}} Common Economy On Held Reserved Parking.png) and 
Matador (Earn {{Money|8}} if played hand triggers the {{hl|orange|Boss Blind}} ability Defeat a Boss Blind in {{hl|orange|1 hand}} without using any discards Uncommon Economy Independent Matador.png): the extra hand allows for the generation of more money.
Vouchers
Hieroglyph ({{hl|orange|-1}} Ante, <br> {{hl|blue|-1}} hand each round Base Hieroglyph.png): Helps make up for Hieroglyph's -1 Hand downside.
Trivia
- Red and Blue backed playing card decks are some of the most common colors used in real-world playing card decks, such as Bicycle decks.
In other languages
| Language | Name |
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| Internal | b_blue |
| Chinese (Simplified) | 蓝色牌组 |
| Chinese (Traditional) | 藍色牌組 |
| Dutch | Blauw kaartspel |
| French | Jeu bleu |
| German | Blaues Deck |
| Indonesian | Blue Deck |
| Italian | Mazzo blu |
| Japanese | ブルーデッキ |
| Korean | 블루 덱 |
| Polish | Niebieska talia |
| Portuguese (Brazilian) | Baralho Azul |
| Russian | Синяя колода |
| Spanish (Spain) | Baraja azul |
| Spanish (Latin America) | Baraja azul |
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| Standard Decks |
- Red Deck ( {{hl|red|+1}} discard every round Unlocked from start Red Deck.png)
 Blue Deck () Yellow Deck ( Start with extra {{Money|10}} Discover at least {{hl|orange|50}} items from your [[Collection|collection]] Yellow Deck.png) Green Deck ( At end of each Round: <br> {{Money|2}} per remaining {{hl|blue|Hand}} <br> {{Money|1}} per remaining {{hl|red|Discard}} <br> Earn no {{hl|orange|Interest}} Discover at least {{hl|orange|75}} items from your [[collection]] Green Deck.png) Black Deck ( {{hl|orange|+1}} Joker slot <br> {{hl|blue|-1}} hand every round Discover at least {{hl|orange|100}} items from your [[collection]] Black Deck.png) Magic Deck ( Start run with the {{V|Crystal Ball|class=hl-purple}} voucher and {{hl|orange|2}} copies of {{tarot|The Fool}} Win a run with the {{D|Red}} on [[Stakes|any difficulty]] Magic Deck.png) Nebula Deck ( Start run with the {{V|Telescope|class=hl-cyan}} voucher <br> {{hl|red|-1}} consumable slot Win a run with the {{D|Blue}} on [[Stakes|any difficulty]] Nebula Deck.png) Ghost Deck ( [[Spectral Cards|{{hl|sblue|Spectral}}]] cards may appear in the shop, start with a {{spectral|Hex}} card Win a run with the {{D|Yellow}} on [[Stakes|any difficulty]] Ghost Deck.png) Abandoned Deck ( Start run with no {{F|}}[[Card Ranks#Face cards|{{hl|orange|Face Cards}}]] in your deck Win a run with the {{D|Green}} on [[Stakes|any difficulty]] Abandoned Deck.png) Checkered Deck ( Start run with {{hl|orange|26}} {{suit|Spades}} and {{hl|orange|26}} {{suit|Hearts}} in deck Win a run with the {{D|Black}} on any difficulty Checkered Deck.png) Zodiac Deck ( Start run with {{V|Tarot Merchant|class=hl-purple}}, {{V|Planet Merchant|class=hl-cyan}}, and {{V|Overstock|class=hl-orange}} Win a run with any [[Decks|deck]] on the {{Stake|Red}} difficulty or harder Zodiac Deck.png) Painted Deck ( {{hl|orange|+2}} hand size, <br> {{hl|red|-1}} Joker slot Win a run with any [[Decks|deck]] on the {{Stake|Green}} difficulty or harder Painted Deck.png) Anaglyph Deck ( After defeating each [[Blinds|{{hl|orange|Boss Blind}}]], gain a [[File:Double tag.png|24px]] [[Tags|{{hl|orange|Double Tag}}]] Win a run with any [[Decks|deck]] on the {{Stake|Black}} difficulty or harder Anaglyph Deck.png) Plasma Deck ( Balance [[Chips|{{hl|blue|Chips}}]] and [[Mult|{{hl|red|Mult}}]] when calculating score for played hand <br> {{hl|red|X2}} base Blind size Win a run with any [[Decks|deck]] on the {{Stake|Blue}} difficulty or harder Plasma Deck.png) Erratic Deck ( All [[Card Ranks|{{hl|orange|Ranks}}]] and [[Suits|{{hl|orange|Suits}}]] in deck are randomized Win a run with any [[Decks|deck]] on the {{Stake|Orange}} difficulty or harder Erratic Deck.png)
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| Challenge Decks |
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