Troops with the following third trait//
- Transfer two random gems to [green] at the start of each turn
No, this is not a good idea. One gem per turn might be okay. You have to imagine what will happen when these (inevitably) get stacked on defences. With a troll and Yasmine for example? No thanks.
I thought about this too at first, partly because I had seen it on other games, but yeah, things like this can really break things. 2 gems seems innocuous enough, but when you combine it with things like trolls and other create effects, it can really spiral out of control…fast.