Card Backs of Hearthstone
Below you will find all of the "basic" card backs that are available in Hearthstone.
"Classic"
Play Hearthstone! 
"Fireside"
Visit a Fireside Gathering 
"Legend"
Obtain Legend Rank
Promotional Card Backs
The following card backs are obtained by promotions run by Blizzard. They may be exclusive to a certain period of time or a specific quantity of merchandise.
Blizzard Collector's Editions
"Warlords"
Purchase Warlords of Draenor CE or DDE 
"Legacy of the Void"
Purchase SC2 Legacy of the Void CE or DDE 
"Overwatch"
Buy Overwatch Origins or Collector's Editions 
"Azeroth is Burning"
Purchase Battle for Azeroth CE or DDE
BlizzCon
"Blizzard 2014"
Attend BlizzCon 2014 or buy a Virtual Ticket 
"Blizzard 2015"
Attend BlizzCon 2015 or buy a Virtual Ticket 
"Welcome Inn"
Attend BlizzCon 2016 or buy a Virtual Ticket
Promotional Events
"Heroes of the Storm"
Reach level 15 in Heroes of the Storm 
"Galaxy Gifts"
Login to Hearthstone on a Samsung Galaxy S6
Twitch Prime
"Call of the Light"
Twitch Prime Oktoberbrawl 
"Call of the Void"
Twitch Prime Oktoberbrawl
Tavern Brawls
These card backs are obtained through Tavern Brawls.
"Winter Veil Wreath"
Winter Veil Brawl 
"Secret Level"
Diablo 20th Ann. Brawl
Pre-Order Card Backs
Sometimes when a card expansion releases Blizzard add a promotional card back to those who pre-order a package associated with the expansion. These card backs are only available up until the release of that expansion, and then are locked away forever.
"Molten Core"
Pre-order all 5 wings of Blackrock Mountain 
"The Grand Tournament"
Pre-Order 50 TGT Card Packs 
"Eyes of C'Thun"
Pre-order 50 Old Gods Card Packs 
"Karazhan Nights"
Purchase all of Karazhan within 1 week of release. 
"Fossil"
Pre-Order 50 Un'Goro Card Packs 
"Frostmourne"
Pre-order 50 Frozen Throne Card Packs
"For the Hoard!"
Pre-Order 50 Kobolds & Catacombs Card Packs
ESports Card Backs
These card backs may be somewhat difficult to obtain due to organizational or regional requirements.
"Dalaran Flame"
Join a 25+ Person TeSPA Chapter 
"Power Core"
Attend select ESports events 
"Thrill of Victory"
Attend Certain Hearthstone Events 
"Golden Celebration"
Place Highly in Official Competitive Events
Adventure Card Backs
Completing Heroic wings in Hearthstone Adventures rewards you with a card back. These are the rewards you will receive for completing a specific adventure.
"Heroic Naxxramas"
Clear Heroic Naxxramas 
"Nefarian"
Clear Heroic BRM 
"Staff of Origination"
Clear Heroic LOE 
"The Blue Portal"
Clear Heroic Kara 
"Candle King"
Dungeon Run w/ 9 Classes
Ranked Participation Card Backs
The following card backs are rewarded to those who reach Rank 20 in each ranked gameplay season. Card backs are awarded when the next season starts, which is currently on the first of each month.Once a particular season has ended, the card back for it can never be obtained again.
2014
"Pandaria"
Season 1 (April 2014) 
"Black Temple"
Season 2 (May 2014) 
"Rainbow!"
Season 3 (June 2014) 
"Naxxramas"
Season 4 (July 2014) 
"Icecrown"
Season 5 (Aug. 2014) 
"Pirates!"
Season 6 (Sept. 2014) 
"Hallow's End"
Season 7 (Oct. 2014) 
"Goblins"
Season 8 (Nov. 2014) 
"Gnomes"
Season 9 (Dec. 2014)
2015
"Maraad"
Season 10 (Jan. 2015) 
"Lunar New Year"
Season 11 (Feb. 2015) 
"Ragnaros"
Season 12 (March 2015) 
"Cupcake"
Season 13 (April 2015) 
"Ninjas!"
Season 14 (May 2015) 
"Darnassus"
Season 15 (Jun. 2015) 
"Darkspear"
Season 16 (July 2015) 
"Tournament Grounds"
Season 17 (Aug 2015) 
"Exodar"
Season 18 (Sept 2015) 
"Highmaul"
Season 19 (Oct. 2015) 
"Explorer's Map"
Season 20 (Nov 2015) 
"Thrall"
Season 21 (Dec 2015)
2016
"Love Is in the Air"
Season 22 (Jan 2016) 
"Thunder Bluff"
Season 23 (Feb 2016) 
"Hogger"
Season 24 (March 2016) 
"Clutch of Yogg-Saron"
Season 25 (April 2016) 
"Shadowmoon Valley"
Season 26 (May 2016) 
"Zul'Drak"
Season 27 (June 2016) 
"Tanned Tinyfins"
Season 28 (July 2016) 
"Medivh's Invitation"
Season 29 (Aug 2016) 
"Legion"
Season 30 (Sept 2016) 
"Pie"
Season 31 (Oct 2016) 
"Halfhill"
Season 32 (Nov 2016) 
"Jade Lotus"
Season 33 (Dec 2016)
2017
"Grimy Goons"
Season 34 (Jan 2017) 
"Kabal"
Season 35 (Feb 2017) 
"Year of the Kraken"
Season 36 (Mar 2017) 
"Un'Goro Mystery"
Season 37 (Apr 2017) 
"Sunwell"
Season 38 (May 2017) 
"The Magic of Dalaran"
Season 39 (June 2017) 
"HearthS'mores"
Season 40 (July 2017) 
"Blood Knight"
Season 41 (Aug 2017) 
"Frost Knight"
Season 42 (Sept 2017) 
"Unholy Knight"
Season 43 (Oct 2017) 
"Gone Fishin'"
Season 44 (Nov 2017) 
"Catacomber"
Season 45 (Dec 2017)
2018
"Frostfire"
Season 46 (Jan 2018)
Hero Card Backs
The following card backs are obtained when purchasing new heroes from the store.
"Alleria"
Buy Alleria Windrunner 
"Medivh"
Buy Medivh 
"Magni"
Buy Magni Bronzebeard 
"Tyrande"
Twitch Prime Nov 2016
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Posted Dec 31, 2019 (Descent of Dragons)I'm really reallllly sad I missed the lightning strike looking card back, I really want it T_T
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Posted Dec 14, 2019 (Descent of Dragons)pls update
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Posted Jul 12, 2019 (Rise of the Mech)The REAL reason Hearthpwn is shutting down, they were tired of hearing people asking to update this page
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Posted May 6, 2019 (Rise of Shadows)Hi,
Just saw these one, first time !
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Posted May 9, 2019 (Rise of Shadows)See all of them here... https://www.hearthpwn.com/guides/592-the-card-backs-of-hearthstone?comment=412
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Posted Apr 3, 2019 (Level Up Nerf)Still no update :(
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Posted Apr 4, 2019 (Level Up Nerf)https://hearthstone.gamepedia.com/Card_back
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Posted Apr 1, 2019 (Level Up Nerf)i dont know why they dont update this Page. Is is that hard to add the newer Card backs? Or is it a running gag that ppl. always complain about this Page? ^^
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Posted Mar 24, 2019 (Level Up Nerf)PLEASE UPDATE FOR THE LOVE OF YOGG SARON
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Posted Mar 6, 2019 (Level Up Nerf)F
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Posted Jan 4, 2019 (Level Up Nerf)I would like to see the 2018 cardbacks!
please update!!
Tkx in advance!!!
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Posted Dec 12, 2018 (Rastakhan)Update this page, please.
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Posted Jan 2, 2019 (Level Up Nerf)agreed
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Posted Nov 16, 2018 (Boomsday)I mean, is it really that hard to keep a simple page updated? Even someone from the community has gone to the full extent of creating a source of every card back. More than can be said for whoever looks after this page.
Up your game.
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Posted Oct 4, 2018 (Boomsday)Update please!
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Posted Oct 2, 2018 (Boomsday)New cardback revealed !
https://imgur.com/a/wcGAiLj
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Posted Sep 8, 2018 (Boomsday)NOTE: DUE TO HEARTHPWN SHUTTING DOWN SOON, I HAVE MOVED THIS POST TO OUTOFCARDS WEBSITE HERE: https://outof.cards/forums/hearthstone/hearthstone-general/468-entire-card-back-set I WILL CONTINUE TO UPDATE THIS POST OVER ONTO THAT WEBSITE. I WILL NO LONGER UPDATE THIS POST HERE DUE TO THE HEARTHPWN SHUTTDOWN COMING SOON.
I don't know why HearthPwn haven't been updating their Card Back Galley page.
But if anyone is interested in seeing the "ENTIRE CARD BACK SET" and how to get them, I have a personal collection that everyone can look at, on GoogleDrive, at the following link...
https://drive.google.com/open?id=1zyiCo83uYzkPA8m6qGQfhFBXLyzGKieN_35HC-zxUDo
Some are not as rendered as good as HearthPwn does it but the whole card back collection is there, I keep this link up to date.
Entire Card Back Set - Last Updated: June 3rd, 2019
Currently there are 118 card backs ever revealed. The document has a blue number on top of each card back representing the order of when the card back was announced (not the order it was added to the game), then card back image, then name of the card back, then how to get the card back, then the card back flavor text and then lastly if the card back can still be obtainable or not.
Also send an in-game friend request if you like too, my battle tag ID will show up on top. I'm a big card back collector but I'm also a casual player so I do not have every card back because I get stuck at curtain game modes or has never been to any official Blizzard esport events.
NOTE: My post may also be found on HearthPwn's General Discussions Forum by clicking here... https://www.hearthpwn.com/forums/hearthstone-general/general-discussion/225793-entire-card-back-set
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Posted Sep 9, 2018 (Boomsday)True MVP
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Posted Sep 9, 2018 (Boomsday)Really well done document! Nice.
PS: I think Maiev is no longer obtainable
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Posted Sep 10, 2018 (Boomsday)I was unsure, so I logged onto my brother's Hearthstone account, (he hasn't played for over 2 years) upon logging in, the quests for both Maiev and Lunara heroes popped up. That is why I labeled Maiev as still obtainable.