Spoilers just in case for his current status. I heard that he was in a Contest Of Champions series from a couple of years ago (By Al Ewing.), but I heard that was questionable in terms of continuity. But was the Maestro supposed to be part of the regular Marvel Universe? I kind of got the sense that Future Imperfect was supposed to be his only story. Then again, I DO remember him making something of a cameo in Pad's first Hulk story (If I recall correctly, it was something to do with the Asgardian Destroyer from the Thor mythos.). I know that he also had a part in a Bendis Avengers storyline (The one with Kang and Ultron.), but that was by Bendis, and not PAD.
Thanks for the help. I hope that everyone had a Happy Holiday.