I've been on a quest to find a word that I knew, but eventually forgot. It's not a common word. I remember I liked its aesthetics. I searched synonyms for all words I could think of, and I still can't find it. These synonyms would include facilitator, conductor.
Consider this example:
Someone had an idea, and I wanted to (act as/serve as/be) a * to that idea.
Meaning that I want to facilitate it/allow it to happen/help it come to life. Almost as if I'm serving as an open doorway to that idea. I seem to remember associating that word with energy conductivity.