We'll need some clarification on what the text means. Does "your other Battlecry minions" mean "your Battlecry minions that aren't Barista Lynchen" or does it mean "your Battlecry minions that aren't this minion"?
I don't see it.. grumble was hard enough to play with enough battlecries and is only one mana more...
and I did play grumble a lot in even shaman which is a tempo deck that normally HAS the board and it has enough battlecry minions .
It's not class specific and is powerful just it isn't INSANE or anything in the average case you are getting maximum of one battlecry minion and normally you would play this with the other battlecry minion in the same turn..
Jade Rogue? I don't think this will be good in jade shaman, because people have Spirit Echo there. If the point of your deck is to copy battlecry quest rewards, then you are better off using Zola the Gorgon, as both of those examples will rotate out to wild in one week. And I don't think this will be used in shaman combo decks (Shudderwock won't work, I know), because Grumble reduces the cost of the minions to 1.
Neat in Pogo Rogue, good with Jan'alai (people tend to prioritize killing the Rag over the bird)
Omega Agent is now a legit possibility, since you can effectively triple the value with just 10-mana, which can be a serious win condition against slow decks
You could also build a gimmicky Shudderwock build by running double Twilight Drake and a Coppertail Imposter to make your Shudderwock as unkillable as possible. The next turn you play Barista and get your Shudderback and then the previous Shudderwock needs to stay on the board for one more turn so you can pull off a Shudderloop where each time you play Shudderwock he copies the Shudderwock already on the field who is protected by big health and stealth.
fairly inconsistent, but hey, good enough for the memes.