I Found Varys Most Powerful Little Bird

In a Storm of Swords Varys gives Tyrion a detailed report on what went on inside the conclave of the archmaesters in the citadel. This leads Tyrion to realize that Varys has little birds in the citadel as well. I think I know who that little bird is, the archmaester who is willing to rat out the others and ruin their plans. I think it is none other than the man who calls his colleagues the grey sheep and rejects their teachings. That's right I think Marwyn the mage might be working with lord Varys and I think I might know why and the fallout from this being the case has some pretty massive implications for the overall story and the plots of Varys, Illyrio and Marwyn.