The original task was to find a way to make a Legendary creature who was a child that was a solid playable card, but still felt childlike. I toyed with "Whenever a non-Legendary creature enters the battlefield under your control, put a +1/+1 counter on it" as a sort of "I like animals" mechanic, but it didn't seem obvious enough, and still felt a bit grown up. I kind of like this answer better. It's a bit more of "I wander in the woods, and if someone doesn't kill me (which they probably won't, because I like animals, and they aren't spooked by me), I come back with lots stuff to makes the tribe a little better." It feels a bit more, to me, what a ten year old could do to help its struggling community.

Delightful implementation of the top-down concept. Nicely done.