Mutavault

Land   

: Add to your mana pool. : 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.

148 MOR • ENFred Fields

™ & © 1993—2008 Wizards of the Coast

Legal in: Modern,Extended,Lorwyn-Shadowmoor Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Tribal Wars Standard,Classic,Singleton 100,Commander

Oracle Text (click to copy):

Mutavault Land {T}: Add {C} to your mana pool. {1}: Mutavault becomes a 2/2 creature with all creature types until end of turn. It's still a land.

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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 can attack, and its  abilities can be activated, only if its controller has continuously controlled that permanent since the beginning of his or her most recent turn. It doesn't matter how long the permanent has been a creature.
7/1/2013
Examples of creature types include Sliver, Goblin, and Soldier. Creature types appear after the dash on the type line of creatures.

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Card Mutavault is not on TCGPlayer.