Hearthstone Update 21.3 Patch Notes (Official) – Sep 21, 2021

Hearthstone update 21.3 (Sep 21, 2021) is now available to download on PC. According to the official Hearthstone patch notes, the latest update added changes for battlegrounds Hero and Minions. Apart from this, Hearthstone Battlegrounds patch 21.3 also includes Duel and Arena updates.

Read full details below.

Hearthstone 21.3 Patch Notes – Sep 21, 2021

Standard and Wild Updates

The following cards have been adjusted down in power level.

Irebound Brute

  • Old: [Costs 7]  New: [Costs 8]



Dev Comment: Irebound Brute was playable a bit earlier than intended on average. Pushing it back a turn should soften extreme turns.

Mindrender Illucia

  • Old: Battlecry: Swap hands and decks with your opponent until your next turn.  New: Battlecry: Replace your hand with a copy of your opponent’s until end of turn.


Dev Comment: With the refinement of Shadow Priest in recent weeks, Mindrender Illucia has been overperforming in the archetype, in an unintended way. Instead of being used as a late game disruption tool, Shadow Priests have been using Illucia as an early game play to essentially skip the opponent’s turn. This change is aimed at removing that problematic gameplay from Illucia, while still keeping her in a similar space with her effect.

Perpetual Flame

  • Old: [Costs 1]  New: [Costs 2]


Dev Comment: Perpetual Flame is a very efficient removal tool for Questline Shaman. Going up one mana here will give board-based decks a better shot against Shaman in the early- and mid-game.

Command the Elements

  • Tame the Flames (the third portion of the Questline)
    • Old: Play 2 cards with Overload. Reward: Stormcaller Bru’kan.  New: Play 3 cards with Overload. Reward: Stormcaller Bru’kan.


Dev Comment: Slowing down the speed at which Questline Shamans can get their final reward should open up more room for counterplay, particularly from slower strategies.

The Demon Seed

  • The Demon Seed (part 1 of the Questline)
    • Old: Take 6 damage on your turns. Reward: Lifesteal. Deal 3 damage to the enemy hero.  New: Take 8 damage on your turns. Reward: Lifesteal. Deal 3 damage to the enemy hero.
  • Establish the Link (part 2 of the Questline)
    • Old: Take 7 damage on your turns. Reward: Lifesteal. Deal 3 damage to the enemy hero.  New: Take 8 damage on your turns. Reward: Lifesteal. Deal 3 damage to the enemy hero.
  • Additionally, The Demon Seed is now banned in Wild.



Dev Comment: After monitoring both Standard and Wild since the release of Stormwind, we’ve decided to both increase the damage required on the first two steps for Standard and ban the Questline in Wild. In Standard, we are slightly upping the amount of damage needed to complete the Questline to slow down the speed at which Tamsin locks up games. In Wild, where there are many more efficient self-damaging cards, The Demon Seed can be completed at an unintentionally fast rate. We are banning the card to protect the format from the problematic gameplay it created. When The Demon Seed rotates to Wild, we will unban it and reposition the card to be more appropriate for the format.

Runed Mithril Rod

  • Old: [Costs 3]  New: [Costs 4]


Dev Comment: Runed Mithril Rod is overperforming relative to mana-generation sources in other classes, mainly due to Warlock’s card draw potential. Going up one mana will bring Runed Mithril Rod’s power level more in line with what other classes have access to.

The cards listed above will be eligible for a full dust refund for 2 weeks after the 21.3 patch goes live.

The following cards have been adjusted up in power level.

Dev Comments: We’re looking at opening up a few more strategies for some of the less-diverse classes and underrepresented archetypes in the Standard metagame. These buffs are aimed at some of the weaker archetypes to make them more appealing options to play with. Some of these changes are on the lighter side, in anticipation of the mini-set coming in the next major patch after the patch launching Mercenaries.

Leatherworking Kit

  • Old: [Costs 2]  New: [Costs 1]


Selective Breeder

  • Old: 1 Attack, 1 Health  New: 1 Attack, 3 Health



  • Old: [Costs 2]  New: [Costs 1]


Mordresh Fire Eye

  • Old: [Costs 10] 10 Attack, 10 Health  New: [Costs 8] 8 Attack, 8 Health


Stormwind Freebooter

  • Old: 3 Attack, 3 Health  New: 3 Attack, 4 Health


Stonemaul Anchorman

  • Old: 4 Attack, 5 Health  New: 4 Attack, 6 Health


Bloodsail Deckhand

  • Old: 2 Attack, 1 Health  New: 2 Attack, 2 Health


Battlegrounds Updates


  • Turn lengths have been reverted to their pre-21.2 times (turns 3-9 have been reduced by 5 seconds after they were temporarily increased by 5 seconds in Patch 21.2).



  • Snicker-snack
    • Old: [Costs 0] → New: [Costs 2]



  • Dungar’s Gryphon (Eastern Plaguelands Option)
    • Old: In 5 turns, upgrade your Tavern Tier.  New: In 5 turns, your next Tavern Tier upgrade costs (5) less.


Master Nguyen

  • Power of the Storm [Passive]
    • Adjusted the odds of hero power offerings (no text changes).


  • Defiant Shipwright has been removed from the minion pool.
  • Southsea Captain has been returned to the minion pool.

Impatient Doomsayer

  • Old: [Tavern Tier 3] Avenge (3): Add a random Demon to your hand.  New: [Tavern Tier 4] Avenge (4): Add a random Demon to your hand.



  • Old: [Tavern Tier 4] 7 Attack, 5 Health. Your other Demons have +3 Attack. Your Hero is Immune.  New: [Tavern Tier 3] 5 Attack, 4 Health. Your other Demons have +2 Attack. Your Hero is Immune.



  • Old: Deathrattle: Give a friendly Beast +2/+2 and this Deathrattle.  New: Give a friendly Beast +1/+1 and this Deathrattle.


Monstrous Macaw

  • Old: After this attacks, trigger a random friendly minion’s Deathrattle.  New: After this attacks, trigger another friendly minion’s Deathrattle.


Reanimating Rattler

  • Old: [Tavern Tier 4] 6 Attack, 2 Health.  New: [Tavern Tier 5] 7 Attack, 3 Health.


Whelp Smuggler

  • Old: 2 Attack, 4 Health. After a friendly Dragon gains Attack, give it +2 Health.  New: 2 Attack, 5 Health. After a friendly Dragon gains Attack, give it +1 Health.


Impulsive Trickster

  • Old: Deathrattle: Give this minion’s maximum Health to a friendly minion.  New: Deathrattle: Give this minion’s maximum Health to another friendly minion.


Master of Realities

  • Old: [Tavern Tier 6].  New: [Tavern Tier 5].


Peggy Brittlebone

  • Old: 5 Attack, 3 Health. After a card is added to your hand, give another random Pirate +1/+1  New: 6 Attack, 5 Health. After a card is added to your hand, give another friendly Pirate +1/+1.


Dev Comment: The text change portion of this change is just to clarify the card’s current, intended functionality. It does not represent any functional change.


  • Old: 2 Attack, 2 Health.  New: 4 Attack, 4 Health.


Salty Looter

  • Old: 4 Attack, 4 Health.  New: 4 Attack, 5 Health.


Prophet of the Boar

  • Old: 2 Attack, 3 Health.  New: 3 Attack, 3 Health.



  • Old: 1 Attack, 4 Health.  New: 2 Attack, 4 Health.


Bristleback Brute

  • Old: 3 Attack, 3 Health.  New: 4 Attack, 4 Health.


Dynamic Duo

  • Old: 3 Attack, 4 Health.  New: 4 Attack, 5 Health.



  • Old: At the end of your turn, play a Blood Gem on all other friendly minions.  New: At the end of your turn, play a Blood Gem on all friendly minions.


Duels Updates

  • Party Replacements, Rally the Troops, and Oops, All Spells! have all been moved from Passive Treasure Pool 2 to Pool 2 Ultra Rare.
  • All Together Now has been moved from Passive Treasure Pool 1 to Pool 2.
  • Voidtouched Attendant is now banned from deck creation.

Arena Updates

Ramming Mount will no longer be draftable in Arena. Additionally, we discovered a bug with some card offering rates. We’ve addressed that bug and will be re-adjusting the offering rates to match the intended rates, which should help move all classes closer to the 50% class winrate.

Bug Fixes & Game Improvements

  • Addressed an issue causing crashes when the friends list was opened.
  • Addressed an issue where friends could sometimes not be challenged.
  • Addressed an issue where Maestra of the Masquerade would sometimes have you start the game as a Rogue (not her best disguise).
  • Addressed an issue that prevented Grand Magus Antonidas from hitting Stealth targets and resulted in Antonidas potentially hitting the caster’s own face if the enemy hero was in Stealth.
  • Addressed an issue where Tradeable cards would keep enchantments if shuffled into your deck by something other than Tradeable.
  • Fixed bugs where cards like Razormane Battleguard would not properly reduce the cost of cards after Celestial Alignment was played.
  • Addressed an issue where Barrens Scavenger’s cost could be reduced below 1 while you had 10 or fewer cards in your deck.
  • Addressed an issue where Highlord Fordragon would trigger on minions that were not in play.
  • Fixed bugs where cards like Master of Realities and Whelp Smuggler would have an incorrect number of triggers.
  • Addressed an issue where swapping a Tavern Tier 6 minion (such as with Arcane Alteration, Malygos’s Hero Power) would sometimes cause it to disappear.
  • Fixed a visual bug that caused enemy Tavern Tiers to show as reset to Tavern Tier 1.

Download free Hearthstone patch 21.3 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.