I ran this card for a while. A loooong time. I mean, I played with it for months in constructed alongside the likes of
Khalni Garden,
Nest Invader, and
Kozilek's Predator, so I felt like I was as qualified as anyone to evaluate it in cube.
It's.. pretty awful.
Seven attacks is a lot to achieve without throwing away real bodies that you paid for in combat, unlike 0/1 plant tokens or Eldrazi spawn. It's also near impossible to wait until you amass a platoon of seven creatures to pull the trigger, short of running some ridiculous army-in-a-can cards.
At the same cost, I highly recommend
and maybe even
Bow of Nylea, though I've only ever seen the latter perform in limited, and don't know how well it translates to cube.