Land {T}: Add {1} to your mana pool.
Uncommon
{6}: Stalking Stones becomes a 3/3 Elemental artifact creature that's still a land. (This effect lasts indefinitely.)
Illus. Stephen Daniele

8/1/2008: A noncreature permanent that turns into a creature is subject to the "summoning sickness" rule: It can only attack, and its {T} abilities can only be activated, if its controller has continuously controlled that permanent since the beginning of his or her most recent turn.
10/1/2009: The layering rules have changed. Now if you animate a land and its power and toughness are lowered by Mutilate or a similar effect, reactivating the land's ability won't reset the values. This is because you apply all effects that set power and toughness to specific values before you apply any that modify power and toughness, regardless of the order in which the effects resolve.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern