An army of Spitting Image s of Imperious Perfect s is a delight to behold. I've seen it get up to individual "1/1" elves being 11/11, and it is Good.
I think that's a better approach to this idea than Phantom General plus Rite of Replication , although I do love the idea of Followed Footsteps on Geist-Honored Monk or (missing from the last deck) Captain of the Watch .