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.")
Mutable Explorer has 3 listed printings; the most valuable is the Showcase printing from ECL at US$1.84 on TCGplayer's market price. Prices below are the cheapest in-stock listing in the United States.
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