EDIT (2016-02-09): Okay, so back when I did this “Wish-List” post, I had no clue Blackbriar Thron was already on his way into the game with February’s Dc HeroClix WORLD’S FINEST set. Keep that in mind.
Blackbriar Thorn! DC Comics character. “Druid priest” (as far as comics go, basically another “wizard”) from the era of Ancient Rome.
So, depending on what writer/artist team is doing the story, Blackbriar either looks completely human or he still looks like an animated wooden statue. Regardless, when he’s “active”, his powers are at their peak when he’s in physical contact with the Earth. So, probably some Trait to provide bonuses when occupying terrain in the Outdoor portions of maps?
He’s able to become Giant or Colossal. Controls the weather in a relatively small locality, but in the extreme (meaning, creation of gentle downpours to raging thunderstorms to blinding, freezing blizzards).
But his main schtick is control of plant-life. As is typical in superhero genre comics, a lot of ensnaring tendrils of vines of varying thickness. With a speed, power, and ease that makes Marvel Comics’ sci-fi-based supervillains The Plantman and The Green Skull feel completely inadequate.
Too bad WizKids Game Design seems to be ratcheting back on the “Morph” mechanics; it’d be nest to have standard, Giant, and Colossal sculpts and dials for Blackbriar Thorn, with the appropriate scaling of powers to boot. C’est la vie.