Xenograft question

I built a goofy deck using Xenograft (Ally) along with Monkey Cages, Genju of the Falls and Chimeric Mass. Shouldn't the use of all 3 of those cards trigger my Halimar Excavator? What I mean to say is shouldn't all 3 cause the same effect of a creature entering the battlefield thus activating the Ally ability of Halimar?
I thought it would be silly fun to mill with Monkey Cages!
I thought it would be silly fun to mill with Monkey Cages!