Hearthstone Update 21 Patch Notes (Hearthstone v21) – August 3, 2021

Hearthstone update 21 is now available to download on PC. According to the official Hearthstone patch notes, the latest update added wailing caverns mini-set, new battlegrounds updates added a new Hero, new cosmetics, a major update for Duels, an Arena rotation, and more. Apart from this, Hearthstone Battlegrounds patch 21 also includes various bug fixes.

Previously, a big update added various quality of life improvements. Unfortunately, many players are still experiencing several issues while playing the game. Today’s Hearthstone version 21 will fix a few of these issues.

Read full details below.

What is new and fixed in Hearthstone Update 21?

Battlegrounds Updates



  • Dungar’s Gryphon
    • Choose a flightpath. Complete it to get a bonus!


Players with Battlegrounds Perks will have early access to Galewing before it’s formally released on August 10.

Duels Updates

When the 21.0 patch goes live on July 27, all players’ Duels ratings will be reset and the pool of eligible cards you can use to build your 15-card start deck will be updated as follows:

  • (NEW) United in Stormwind
  • Wailing Caverns Mini-Set
  • Forged in the Barrens
  • The Darkmoon Races Mini-Set
  • Madness at the Darkmoon Faire
  • Scholomance Academy
  • (NEW) Kobolds & Catacombs
  • Journey to Un’Goro
  • One Night in Kharazan
  • Whispers of the Old Gods
  • Curse of Naxxramas
  • Legacy (Basic/Classic)
  • Core


Party Replacement

  • At the start of your turn, summon a 2/2 Adventurer with a random bonus effect.


Inspiring Presence

  • After you play a Legendary minion, reduce the cost of a random minion in your hand by (1).


Greedy Gains

  • Your minions have +2/+2 but cost (2) more (up to 10).


Meek Mastery

  • Your Neutral minions cost (1) less and have +1/+1.


Legendary Loot

  • At the start of the game, equip a random Legendary weapon.


Deathly Death!

  • After a friendly Deathrattle minion dies, destroy the minion with the lowest Health.


Ooops, All Spells!

  • At the start of the game, destroy all minions in your deck. Your spells cost (1) less and gain +2 Spell Damage.



The following cards have been banned from between-game card buckets and will not be Discoverable:

  • Final Showdown
  • Lost in the Park
  • Defend the Dwarven District
  • Sorcerer’s Gambit
  • Rise to the Occasion
  • Seek Guidance
  • Find the Imposter
  • Command the Elements
  • The Demon Seed
  • Raid the Docks

Other Banned cards:

  • Unstable Evolution is banned from card buckets but will still be Discoverable.
  • Maestra of the Masquerade is banned from deckbuilding, card buckets, and will not be Discoverable.

Seven new designer card buckets have been added as well:

  • Furious Fel (Demon Hunter)
  • AHHHH RATS!!!! (Hunter)
  • Fire!!! (Mage)
  • SI:7 (Rogue)
  • ARRRRRRG! (Warrior)
  • Auction House (Neutral)
  • Live to Win (Neutral)

Smart buckets have also been updated to include the two new card sets, and two previously missed card sets: Legacy (Classic/Basic) and Demon Hunter Initiate. Lastly, you’ll be able to find United in Stormwind cards in Duels card buckets after the patch goes live and before the expansion launches.

Arena Rotation


When United in Stormwind launches on August 3, the Arena will include cards from the following sets:

  • United in Stormwind
  • Forged in the Barrens
  • Wailing Caverns Mini-Set
  • Madness at the Darkmoon Faire
  • Darkmoon Races Mini-Set
  • The Witchwood
  • Saviors of Uldum
  • Rastakhan’s Rumble
  • Core

Book of Heroes Illidan – Coming August 10


After regaining his freedom, Illidan was eager to prove himself once and for all. But even as he journeyed far from his homeland and joined forces with new allies, the thirst for power never left him. It was only a matter of time before it interfered with his judgment, resulting in more dire consequences than ever before…Defeating all 8 bosses in this linear adventure will reward 1 Demon Hunter pack, containing only Demon Hunter cards from Standard.

United in Stormwind Rewards Track & Tavern Pass

When the Rewards Track refreshes when United in Stormwind launches, all players will automatically be granted any unclaimed rewards on both the free track and the Tavern Pass track (if purchased), and a completely new Rewards Track of unlockable loot will take its place.


The Forged in the Barrens Tavern Pass will expire with the launch of United in Stormwind and a new Tavern Pass will be made available for purchase—offering a host of brand-new cosmetic rewards and XP boosts.


New Cosmetic Coins

Two new Cosmetic Coins are being added with United in Stormwind, the Stormwind coin and the Lordaeron coin. The Stormwind coin is obtainable by completing the first 90 levels of the Rewards Track with the Tavern Pass. The Lordaeron coin is obtainable by collecting 135 unique United in Stormwind cards.


Keep in mind that United in Stormwind will have a 35-card Mini-Set that will make it easier to reach both the 25 total United in Stormwind Legendary cards for the Archbishop Benedictus Diamond card reward and the 135 total United in Stormwind cards for the Lordaeron Cosmetic Coin. We’ll have more information to share about the United in Stormwind Mini-Set in the coming months.

Bug Fixes in 

  • Addressed an issue where Shenanigans would not transform Soul Fragments into Bananas.
  • Addressed an issue where Wicked Stab could be upgraded by cards that temporarily increase mana.
  • Addressed an issue where Shan’do Wildclaw would not lay flat on the board.
  • Addressed an issue where Defender would not play its VO when summoned by Noble Sacrifice.
  • Addressed an issue where golden Soul of the Forest would not summon golden Treants.
  • Addressed an issue where golden Ancestral Spirit would not summon a golden minion.
  • Addressed an issue where golden Grave Rune would not summon golden minions.
  • Addressed an issue where golden Primal Talisman would not summon golden minions.
  • Fixed a Battlegrounds bug where Y’shaarj’s Battlegrounds Hero Power would not take its newly summoned minion into account when deciding which warband attacked first.
  • Fixed a Battlegrounds bug where Baron Rivendare was causing visual issues when in a warband with golden Kaboom Bot.
  • Fixed a Battlegrounds bug where Galakrond’s Greed was missing a tooltip for Discover.
  • Fixed a Battlegrounds bug where Come One, Come All! Was missing a tooltip for Discover.
  • Fixed a Battlegrounds bug where Avatar of N’Zoth was missing a tooltip for Deathrattle.
  • Fixed a Battlegrounds bug where Sprout It Out! Was missing a tooltip for Taunt.
  • Fixed a Battlegrounds bug where Hero Powers for Aranna Starseeker, Infinite Toki, Millhouse Manastorm, Nozdormu, and Tess Greymane were missing a tooltip for Refresh.
  • Fixed a Duels bug where Diamond cards would only be Diamond in appearance for the first game of a run.
  • Fixed a Duels bug where Lone Champion and minions summoned by Gift of Luminance were not buffed by Hold the Line.
  • Updated the description of the Roguish Maneuvers Hero Power in Duels to be more accurate.
  • Addressed an issue with Book of Mercenaries Guff where A Party of Adventurers will cast Against All Odds, even if they have board control.
  • Addressed an issue where one of Lady Katrana Prestor’s emotes was showing incorrect text.
  • Searching “Refund” in the Collection will now populate with cards eligible for a dust refund.
  • Pressing and holding on the Rewards Track page arrows will now flip through the pages quickly.
  • Addressed an issue where if a player disconnected from a ranked match, they’d get a message stating they won their last ranked game upon relogging.

Download free Hearthstone patch 21 on PlayStation 4 and Xbox One.

Jack Johnson
Jack Johnson
Jack Johnson mainly writes about game-related news and updates. He is a passionate gamer, music lover, and traveler.

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