Ahh, you found me... Run!
We lost our most recent game due to the lack of green minions. We needed to place 3 due but only had 2. There was a green minion on the Sorceress card as she had assumed that colour in the previous turn.
Did we play correctly or should we haved used the green minion on the Sorceress card?
You are allowed to remove the green minion from the Sorceress (just as from quest) when spawning minions, however she will suffer one wound from the sudden transformation.