Whatever deck plays this has to run very few neutrals already, or it'll screw itself over. Even then it's a really specific tech card, and bomb warrior and Hakkar haven't seen play in a while. You can run it to turn off your own Hakkar, but outside of that I don't think it's worth playing.
Tech card but against something so niche don't will make the cut.
The only thing I can think aside the tech aspect is being a tool in a heavy draw deck with many neutral minions like gnome, aprentice and acolyte and you run x1 of this card when don't want to draw they anymore...
This is playable for sure. It also only costs 2 mana, so you can use this early game or late game depending on your deck design or counter strategy.
It's also only cards in your deck, so you can easily wait to use this when you know it will not hurt you or remove specific cards you don't want to transform.
I think this is a decent highlander card too. Especially if you are going against a deck you have no chance at, but your class cards might have an answer.
For example, transforming the Pirate that steals weapons is useless against some classes like Priest. So against Priest, go ahead and turn that card into something far more useful.
This basically allows you to play ALL the neutral tech cards with less of a downside. I actually think this card can be a thing.
You can't have a deck full of tech cards, it is weak because you need to draw the correct ones vs the deck your opponent is playing, plus, get a lot of random class cards (many of them are terrible) don't fix the problem of your deck don't have a good win condition by your own.
Only techs work in this game are the very few specific ones when one strategy is far dominating the ladder, like Harrison when you only see warriors or something like that.