New South Wales
I believe it specifies ideas. Do you actually have an green card with the key word stamina?
It can't specify 'ideas' as the released game doesn't use that term. I think it used to back in the Kickstarter, but it has been scrapped in the meantime and its a term the community has resurrected to make things easier.
It could very well specify 'Skill cards', though. That seems the safest way to word the effect.