Mutable Explorer (ECL-186) - 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.")
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.")