Cactusfolk from Thunder Junction, if only because they're abso-effing-lutely amazing. And we need more plant people. Wilden/Killoren were dope.
I really want a crossover book with Outlaws of Thunder Junction. It's a crossroads of planes due to the Omenpaths connecting them with places like Ravnica, Ixalan, Innistrad, Theros, and Strixhaven, and it's the Weird Wild West. The only sentient species native to the plane are the Cactusfolk, and the new planar colonists and settlers thought they were just cacti. It's a crime world, and an Indian Jones type world due to some of the lost ruins of the Fomori Giants' Coin Empire being on the plane too.