Dryad Arbor is the only creature that is also a land at all times. I was wondering how this card would interact with Vengevine, so I went to the gatherer, and the rulings on this card state that it is not a spell. So, unless I am mistaken, playing Dryad Arbor does not help get your Vengevine back onto the battlefield. I just figured I'd post this up so that people would know.