Return of the Choir Master

For the rest of the turn any creatures that are killed create a token that is a copy of them except they are 1/1 Blue/Black/Green changeling wizard creature tokens without any abilities. place a number of -1/-1 tokens equal to {x} on target opponents creature permanents.
"And so they rejoiced upon his return. Their leader had proven other worlds exist and so the signal was given to the faithful to show their true allegiance."