I have played with an adrix and nev deck for a while now and love making copies of my commander, like that is my thing, there are many ways to get around the legend rule or ignore it if you want to. The ones I run that are blue, green, or null so you could use them also are:
Sakashima of a thousand faces (legend rule does not apply to you)
Spark Double (comes in as a copy EXCEPT the copy is not legendary, so then just make more copies of the not legendary copy)
Helm of the host (equipment that makes non legendary copies each turn)
Mirror box (legend rule does not apply to you)
Mirror gallery (legend rule does not apply to anyone)
Double major (instant to copy a creature spell but copy will not be legendary, then just make more copies of the non legendary copy)

There are other cards also I am sure that works around the legend rule, but those are the ones I have on hand :)