|Abilities:||Battlecry, Copy, Summon|
Battlecry: Summon an exact copy of this minion at the end of the turn.
OOZE... Ooze... Ooze... (ooze...)
How to get
|Golden Echoing Ooze||1600||400|
- The Ooze's Battlecry is unlike other Battlecries. Rather than directly causing an effect, it effectively grants the Ooze a triggered effect (denoted by the special "Ooze" visual effect) which activates at the end of the turn. Most of the Ooze's other behaviours make sense once its effect is understood in this way.
- One exception to this rule is that the effect will only activate once - at the end of the first turn after it is granted.
- Like other Battlecries, the effect will be granted again if any Ooze is returned to a player's hand, and played again. Even a "copied" Ooze is "basically a brand new card" once returned to the hand.
- This means an Ooze played, allowed to self-copy, returned to hand, and played again, will result in a total of three Oozes. This is true regardless of whether the "original" or "copied" Ooze is returned to hand.
- An Ooze played, immediately returned (before it copies), and played again will only copy itself once, for a total of two Oozes.
- A visual bug sometimes causes a re-played Ooze to not display the green "Ooze" visual effect, but it will still copy itself at the end of its first turn after being re-played.
- This effect of this minion's buff takes place at the end of the turn, summoning an exact copy of the minion as it exists at that point. Any damage and enchantments will also be copied.
- The Ooze will not copy itself if it is silenced, destroyed or transformed before the end of the turn on which it is played.
- If Power Overwhelming is cast on the Ooze before the end of the turn on which it is played, the Ooze's copy will not die at the end of your turn, but at the end of your opponent's turn. This is likely due to the debuff not being copied until the current "end of turn" phase has already been reached. However, this may be a bug, meaning it might at some point be fixed.
- As of a hot fix in Patch 22.214.171.12451, Brann Bronzebeard will cause Echoing Ooze to spawn two duplicates.
- This minion's Battlecry effect is thus far unique in Hearthstone. It grants a non-enchantment, non-card text triggered effect "state" that can nonetheless be removed through silences. Ben Brode has described the Ooze's behaviour as "weird", stating "it is unlike any other card."
- Previous bugs
- Prior to Patch 126.96.36.19934, the copying buff was not copied by means of copy effects such as Faceless Manipulator or Mirror Entity. This has now been corrected.
Echoing Ooze works well with druid decks focusing on putting as many bodies on the field as possible, especially during the early to mid-game. Its low cost and 2-for-1 mechanic can allow the druid to quickly flood the board with minions, which can then be buffed by Savage Roar to deal huge amounts of damage, either finishing the opponent outright or making it impossible for them to recover.
It also works well in paladin decks, when used in conjunction with their powerful buffs such as Blessing of Kings. Sword of Justice is also worth considering in a deck running Ooze since it will grant two buffs, one for summoning the first Ooze, and a second one to the newly summoned second Ooze; the first buff also being copied to the second Ooze. As a result, playing Echoing Ooze without any other buffs will give you a 2/3 and a 3/4 for 2 mana.
Echoing Ooze was originally envisioned as a 2 Mana, 1/1 Minion, named "Bile Sludge", that had the effect "Deathrattle: Summon two copies of this minion. If you have 7 minions, destroy them all.". 
- Echoing Ooze has its origins in Teenage Mutant Ninja Turtles II: The Secret of the Ooze.
- Patch 188.8.131.5234 (2014-12-04): Bug fix: Copy effects now copy the "echoing" buff as intended.
- Patch 184.108.40.20624 (2014-07-22): Added.
- Ben Brode on Twitter. (2015-02-02).
- Tested by User:jerodast on 2015-02-02.
- Ben Brode on Twitter. (2014-07-21).
- Ben Brode on Twitter. (2014-07-21).
- Ben Brode on Twitter. (2014-07-22).
- https://www.youtube.com/watch?v=qeUisKciCOs Tested in Patch 220.127.116.1151 (2016-03-14)
- Ben Brode on Twitter. (2014-10-08).
- Ben Brode on Twitter. (2017-06-05).
- Ben Brode on Twitter. (2014-08-11).