I had a board with Conspirator+Scheme some days ago. There were some other cards that should help, like Market and Forge. I lost, but I think it was mainly my fault. First, of course you still need some trashing for the Conspirators, and delaying Forge for (I think) Consp+Market was probably not the best move I made this day. Espescially as the Forge usually already comes in late. Second, I remember me buying too many Markets. Think one should be enough to get the buy.
So in the end it worked quite well, but not before the battle was more than over, against some Governor-supported thing, but as mentioned, I think that was mainly my fault. I'm also not sure if at the beginning I was fully aware how to use the schemes correctly.