Mutavault

Land
{T}: Add {1} to your mana pool.
{1}: Mutavault becomes a 2/2 creature with all creature types until end of turn. It's still a land.
Some changelings born at Velis Vel never return, but their essence never leaves.
Illus. Fred Fields

Gatherer Card Rulings [Nov 2009]

• 4/1/2008: Although Mutavault has all creature types while it's animated, it does not have the changeling keyword ability.
• 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.

Format Legality	Legal in Vintage, Legacy, Extended Banned in Standard
Printings (2/11)	Morningtide (Rare) Champs (Special)