Set it up how..?
Every time it multiplies you can shut it down (lock-destroy), just like that kikimore card which doesn't see play now days for the very same reason even though it's way less expensive than Ethereal.
It's fine to nerf Ethereal twice in less than 2 months time while leaving NG to it's double even triple Ball and ton of poisons-locks-removals for the sake of "theme".
Yeah it all makes sense, so much sense ! lol
I realise that 2 wrongs don't make a right but this is ridiculous, why did they even bother releasing it in the first place, even a blind man could predict this outcome..pfft .