The landwalk ability (with land substituted by any one of Plains, Island, Swamp, Mountain or Forest) is found only on a handful of creatures in the current standard. Somberwald Dryad is one of a handful of cards in the current Standard format with landwalk.
A major new format introduced in Innistrad and Dark Ascension is the two-sided card. Here is a selection. Some of these cards transform once, and some transform back and forth depending on a specific condition.