Mutable Explorer (Showcase) [Lorwyn Eclipsed]

Changeling (This card is every creature type.)
When this creature enters, create a tapped Mutavault token. (It’s a land with “{T}: Add {C}” and “{1}: This token becomes a 2/2 creature with all creature types until end of turn. It’s still a land.”) “It had been to warrens and kithkin taverns, but found a home in the hidden cavern.”*The Changeling’s Search*