I created a new game the other day, with the specific intention of collecting all the deidric artifacts, and got the mission for three of them within an hour of creating a new game. Went straight to Windhelm and Sanguine challenged me to a drinking competition, which teleported me to Markarth where I immediately went into the abandoned house to activate the quest for Molag Bal, and after leaving was given an invitation for what will lead to Mahrunes' Razor. It's almost like the game knew exactly what I was after and just gave it to me.