You should drop the eldrazis (except
Void Winnower) for more fun ETB and LTB creatures like
Sower of Discord and
Shadowgrange Archfiend. They aren't as big but you get immediate effects when they hit the field instead of having to wait a round to swing. Since Ninjutsu puts creatures on the battlefield already attacking you don't get initial annihilator triggers and since you're not casting you don't get the other eldrazi effects. I run a
Sphinx of the Second Sun in my version which is a lot of fun after combat to get another beginning phase