Mutable Explorer

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*