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A player with 1 mana Overloaded this turn, and 2 mana Overloaded for next turn.

Overload is an ability which reduces the amount of mana available the next turn by the stated amount, indicated in the user interface by padlock icons.

Cards with this ability are limited to the shaman class.


Overload on a card must be paid, and will lock out your next turn's mana even if you have sufficient mana this turn to pay the cost in full.

  • Mana-generating effects like The Coin and Innervate can be used to gain mana beyond current Overload.[1]
  • You can Overload more mana than you will have the next turn (this situation is very unlikely, since most Overload costs are at most one greater than the card's own mana cost, but can still be achieved by playing multiple Overload cards on an early turn or Elemental Destruction on turn 3): while not displayed, the excess will still be registered, and will counter mana generation through effects such as The Coin.
For example, if the player plays two Dust Devils on turn 2, the result will be an Overload of 4 mana on turn 3: only 3 Overload will show in the interface (since the player has only 3 Mana Crystals), but if The Coin is used, the player will still have 0 mana, and will be unable to play any 1 mana cards.[2]; once the Overload has been matched, any further mana generated will be usable by the player, and will be reflected in the mana counter.[1]
  • No amount of Overload will prevent the player from playing 0 mana cards: since these cards cost no mana, the player's current mana total is irrelevant.[1][2]
  • If a minion with Overload is summoned through a summon effect (such as Mounted Raptor or Hungry Dragon) the player will not gain any Overload.
  • If a spell with Overload is stopped by Counterspell the player will not gain any Overload, and thus Tunnel Troggs will not trigger. However, regardless of order of play, Unbound Elementals will still trigger, since you actually played a card with Overload.
Visual appearance

Overloaded mana is indicated in the user interface by padlock icons: Overloading mana causes a padlock icon to appear beneath a Mana Crystal for each point of mana Overloaded; at the start of the next turn, the padlocks will move up and block out the player's Mana Crystals, effectively preventing them from being refilled.

  • The user interface will only display Overload equal to the player's maximum mana this turn, even if the Overload exceeds this amount.[1][3] For example, Overloading for 10 mana on turn 9 will only display 9 Overload, but at the start of turn 10 a 10th Overload icon will appear to correctly indicate that all 10 mana are Overloaded.[1]
  • While The Coin works correctly in relation to excess Overloaded mana, the visual effect does not: playing The Coin while having more Overloaded mana than current Mana Crystals will create a new, fully charged, non-padlocked Mana Crystal; however, the player will not be able to draw mana from that Mana Crystal, due to Overload.[2]
  • Effects that destroy Mana Crystals have no effect on current/pending Overload, despite the visual appearance of destroying a pending Overloaded Mana Crystal.
  • Overloaded mana is not displayed for the opponent: players trying to estimate the opponent's available mana next turn can use the history to check the cards played that turn.


Overload allows shamans to deal very effective burst damage, and to summon some powerful minions in the early game. Overload adds an additional strategic element to the game, with the shaman gaining tempo and presence in the current round in exchange for restricted activity in the next.

Used unwisely, Overload can leave the shaman starved of mana the next turn, causing them to lose pace and potentially drop behind in the game. Be wary of using Overload in early rounds to summon powerful minions which can be easily removed by the opponent next turn, since the additional Overload cost can cause the shaman to pay twice over. Used wisely, Overload can allow the shaman to respond to demanding situations with surprising momentum.

An additional strategic element is added through certain Overload-related cards. Cards like Lava Shock and Eternal Sentinel remove all Overload for the current and coming turn, allowing the shaman to free up mana and drastically reduce the overall cost of their Overload cards, especially if played after incurring a large amount of Overload. Other cards such as Tunnel Trogg and Unbound Elemental offer a simpler synergy, with triggered effects activating in response to Overload. Overload decks combine cards such as these with a large amount of Overload cards, using cards like Lava Shock to reduce their cost, while using the Overload-triggered cards for additional threats.

Cards with Overload

Name / Desc Rarity Type Subtype Class Cost Atk HP Description
Drakkari Defender Common Minion General Shaman 3 2 8 Taunt
Overload: (3) Sometimes, the best defense is an offensive troll.
Dust Devil Common Minion Elemental Shaman 1 3 1 Windfury. Overload: (2) Westfall is full of dust devils. And buzzards. And crazed golems. And pirates. Why does anyone live here?
Flamewreathed Faceless Common Minion General Shaman 4 7 7 Overload: (2) He's on fire! Boomshakalaka!
Forked Lightning Common Spell Shaman 1 Deal 2 damage to 2 random enemy minions. Overload: (2) If you combine it with Spooned Lightning and Knived Lightning, you have the full dining set.
Lightning Bolt Common Spell Shaman 1 Deal 3 damage. Overload: (1) Lightning Bolt! Lightning Bolt! Lightning Bolt!
Stormcrack Common Spell Shaman 2 Deal 4 damage to a minion. Overload: (1) WARNING: DO NOT TOUCH THE PURPLE BALL OF LIGHTNING
Stormforged Axe Common Weapon Shaman 2 2 3 Overload: (1) Yo, that's a nice axe.
Feral Spirit Rare Spell Shaman 3 Summon two 2/3 Spirit Wolves with Taunt. Overload: (2) Spirit wolves are like regular wolves with pom-poms.
Jade Claws Rare Weapon Shaman 2 2 2 Battlecry: Summon a Jade Golem. Overload: (1) "Best manicure ever!" - Aya Blackpaw
Jinyu Waterspeaker Rare Minion General Shaman 4 3 6 Battlecry: Restore 6 Health. Overload: (1) Waterspeakers can tell the future! So the Jade Lotus employs them to speculate on the Auction House.
Lava Burst Rare Spell Shaman 3 Deal 5 damage. Overload: (2) It's like an ocean of liquid magma in your mouth!
Lightning Storm Rare Spell Shaman 3 Deal 2-3 damage to all enemy minions. Overload: (2) An umbrella won't be effective, I'm afraid.
Volcano Rare Spell Shaman 5 Deal 15 Damage randomly split across all minions. Overload: (2) Many young shaman summon a volcano as their first school project.
Doomhammer Epic Weapon Shaman 5 2 8 Windfury, Overload: (2) Orgrim Doomhammer gave this legendary weapon to Thrall. His name is a total coincidence.
Earth Elemental Epic Minion Elemental Shaman 5 7 8 Taunt
Overload: (3) Nothing beats rock.
Finders Keepers Epic Spell Shaman 1 Discover a card with Overload. Overload: (1) INFINITE LOOP!
Showing all 16 cards
Drakkari Defender(62887).png
Dust Devil(129).png
Flamewreathed Faceless(35226).png
Forked Lightning(530).png
Lightning Bolt(10).png
Stormforged Axe(152).png
Feral Spirit(214).png
Jade Claws(49724).png
Jinyu Waterspeaker(49719).png
Lava Burst(679).png
Lightning Storm(676).png
Earth Elemental(124).png
Finders Keepers(49749).png

Wild format

Wild icon.png  This section contains information exclusive to Wild format.
Name / Desc Rarity Type Subtype Class Cost Atk HP Description
Ancestral Knowledge Common Spell Shaman 2 Draw 2 cards. Overload: (2) MOMMMMMYYYYYYYYY!!!
Crackle Common Spell Shaman 2 Deal 3-6 damage. Overload: (1) Snap! This card! Pop!
Fireguard Destroyer Common Minion Elemental Shaman 4 3 6 Battlecry: Gain 1-4 Attack. Overload: (1) Ragnaros interviews hundreds of Fire Elementals for the position of "Destroyer" but very few have what it takes.
Totem Golem Common Minion Totem Shaman 2 3 4 Overload: (1) What happens when you glue a buncha totems together.
Dunemaul Shaman Rare Minion General Shaman 4 5 4 Windfury, Overload: (1)

50% chance to attack the wrong enemy. He just closes his eyes and goes for it. Raarararrrarar!

Elemental Destruction Epic Spell Shaman 3 Deal 4-5 damage to all minions. Overload: (5) I'm not a shaman or anything, but isn't Elemental Destruction the opposite of what they want to do?
Siltfin Spiritwalker Epic Minion Murloc Shaman 4 2 5 Whenever another friendly Murloc dies, draw a card. Overload: (1) The elements respond to anyone who calls them for a worthy cause, even if you call them by yelling, "MRGHRGLGLGL!"
Neptulon Legendary Minion Elemental Shaman 7 7 7 Battlecry: Add 4 random Murlocs to your hand. Overload: (3) Neptulon is "The Tidehunter". He’s one of the four elemental lords. And he and Ragnaros get together and make really amazing saunas.
Showing all 8 cards
Ancestral Knowledge(22319).png
Fireguard Destroyer(14455).png
Totem Golem(22265).png
Dunemaul Shaman(12234).png
Elemental Destruction(22345).png
Siltfin Spiritwalker(12277).png

Related cards

Name / Desc Rarity Type Subtype Class Cost Atk HP Description
Unbound Elemental Common Minion Elemental Shaman 3 2 4 Whenever you play a card with Overload, gain +1/+1. Unlike bound elementals, Unbound ones really enjoy a night on the town.
Eternal Sentinel Epic Minion General Shaman 2 3 2 Battlecry: Unlock your Overloaded Mana Crystals. Just try to avoid eye contact.
Finders Keepers Epic Spell Shaman 1 Discover a card with Overload. Overload: (1) INFINITE LOOP!
Snowfury Giant Epic Minion Elemental Shaman 11 8 8 Costs (1) less for each mana crystal you've Overloaded this game. This minion goes all the way to 11!
Showing all 4 cards
Unbound Elemental(51).png
Eternal Sentinel(35231).png
Finders Keepers(49749).png
Snowfury Giant(62918).png

Kobolds and Catacombs

The below cards are planned for release with Kobolds and Catacombs, coming December 2017.

Name / Desc Rarity Type Subtype Class Cost Atk HP Description
Lesser Sapphire Spellstone Rare Spell Shaman 7 Summon 1 copy of a friendly minion. (Overload 3 Mana Crystals to upgrade.) 
Sapphire Spellstone Rare Spell Shaman 7 Summon 2 copies of a friendly minion. (Overload 3 Mana Crystals to upgrade.) 
Showing all 2 cards
Lesser Sapphire Spellstone(73330).png
Sapphire Spellstone(73333).png

Wild format

Wild icon.png  This section contains information exclusive to Wild format.
Name / Desc Rarity Type Subtype Class Cost Atk HP Description
Tunnel Trogg Common Minion General Shaman 1 1 3 Whenever you Overload, gain +1 Attack per locked Mana Crystal. Sure, they're ugly, but they live in tunnels. You try your beauty routine without natural light.
Lava Shock Rare Spell Shaman 2 Deal 2 damage.
Unlock your Overloaded Mana Crystals. Chocolate lava cake is shockingly delicious.
Showing all 2 cards
Tunnel Trogg(27246).png
Lava Shock(14440).png

Fixed bugs

  • For a few weeks during Patch (LoE patch), playing a minion or spell with Overload caused you to become Overloaded the moment the card was paid for. For example, if Counterspell countered your Lightning Bolt, you were still Overloaded[4][5] (normally Counterspell triggers before Overload, preventing the effect entirely).


  • Until Patch, the title for this keyword in the game's strings was "Recall".[6] This may reflect an earlier concept for the Overload mechanic, or an entirely separate mechanic from the game's alpha.


  1. 1.0 1.1 1.2 1.3 1.4 BuB ChaCha (2015-02-17). Overload:(10) vs. Innervate 超載:(10) vs.啟動
  2. 2.0 2.1 2.2 Tested by User:Taohinton, 2014-02-19. Tested twice: Played Dust Devil x 2 on turn 2. On turn 3 the mana bar showed 0/3 mana. Played The Coin and a fourth mana crystal appeared, without a padlock. However, the total remained at 0/3, and I was unable to play any 1 mana cards
  3. BuB ChaCha (2015-02-16). Overload: (20) =?|超載:(20) =?
  4. http://us.battle.net/hearthstone/en/forum/topic/19877077551?page=1#4 Tested in Patch (LoE patch)
  5. Ben Brode on Twitter. (2015-11-16). 
  6. http://hearthstone.gamepedia.com/index.php?title=User:Taohinton/Strings/GLOBAL&diff=prev&oldid=180662