Green Has the Root Wall Ability.

Green represents creatures that have a natural affinity against magic, and it's very hard for magic to get a hand on them. On other bilders, you'll see in green, green has we call the stalking ability which means only one creature can block it. The reason is the same reason that has affinity with land. It understands the land, then allows it to sort tof blend into the land, and that it can sneak through land and you can't see it.