I know that Zilean and Yorick can't use their ultimate abilities on a friendly Shaco's clone but can a Mordekaiser use his ultimate on it? Also can he get a ghost from my clone if he kills me and the clone but he doesn't use it on the real shaco?
Morde's ulti used to work on Shaco's clone in the past, but I'm not sure if they have changed it. I don't think so, since I haven't read anything about it in any recent patch notes. Therefor, he should be able to ulti your clone.