I mean by that time you have enough energy to deploy a very strong commander with force orgasm or sodomize defiler. Considering how common pre broken chosen have become triggering rampage and breaking it is definely worth it for both achievement farm and energy farm.The issue is that unless you start the battle capturing them, within the first couple turns they'll increase their HATE on their own meaning from the very first surround they're triggering Rampancy, making it pretty difficult to stop them from doing that.
Trigger rampage->Free energy-> Break Rampage->Get all t4 Breaks->Sacrifice
Btw the item upgrade for Rampage seems kinda weird. It needs you to have sacrificed Rampage forsakens to work. But I don't know if it means the forsaken will be revived again and again with no limit(Free sacrifice achievement?) or not. If it works every loop I guess it can be helpful if you plan on keeping multiple rampage forsaken for different situations.
The base rampage item was great so the upgrade seems a bit lacking.