Interesting. There are pros and cons to the new mechanic.
The pro is that if it travels to your opponent's side, then they cannot make use of its ability again unless they have
...
on the other hand, that would mean you would need a way of producing more if you want to continue to spam the effect.
The old way, it spams continuously, but it can end up destroying as many of your creatures as your opponents.
I'm not sure which I like better, both would be a very interesting addition.