Ghalta, Primal Hunger was spoiled early (or was it leaked, not sure, it was shown to be a promo card of some sort anyhow). It has kind of a unique bonus, if you ramp through creatures, so let’s see what we can come up.
First question: Why not Ezuri, Renegade Leader or Kamahl, Fist of Krosa instead? Ezuri is easy. I don’t have to limit myself to elves. Kamahl is a bit more difficult. First answer is I have done Kamahl and Baru is something new. Second answer is that Baru can bring something quite unique to the table. Each of the ramp spells in your deck becomes a mini-Overrun. Or in some cases something much, much more.