Oh the allure of the Tzeentch god. While I do very much enjoy Fateweaver, the Lord of Change, and the use of Bolt, they haven't quite struck my fancy yet. The Keeper of Secrets, god of Slaanesh, Claws, and unilateral breasts have kept me interested so far.
But I don't know Tzeentch's Dark Agent, maybe you could .... "Lord of Change my mind"... haha, sorry, sorry. That was barely funny and might sound a little homosexual (Not that there's anything wrong with that).