Speaking of destructive, I think it's only fair to let you see one of my best wind spells.

[Wendy angles her head towards the sky and takes an improbably deep breath. A magic circle appears in front of her as she cries out her spell.]

Sky Dragon's... Roaaaar!

[A powerful gale erupts from Wendy's mouth, tearing through the air and leaving a massive hole in a cloud overhead.]

I'm not to the point where I can destroy whole mountains like Natsu, but I think I've gotten pretty strong now.