Voted Ayula, but more so because it seems like an interesting candidate for a tribal or voltron build. That built in counter and fight mechanic is pretty cool to me and might try that myself down the road.
Thought process here is that mono-green doesn't have access to "choose creature type" effects like other colours do in the sense we can't change other creature types into bears. There are a lot of options that are repeatable to create more bears, however, and arming Ayuli with a bunch of equipment could be unbearable for opponents if you buff her up with the counter ability in addition.