Excursionista mutable
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.")
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Reglas oficiales (5) · Scryfall
Mutable Explorer's last ability creates a token that's a copy of the card Mutavault in the Oracle card reference. Official text for Mutavault can be found using the Gatherer card database at Gatherer.Wizards.com.
If an effect causes a creature with changeling to become a new creature type, it will be only that new creature type (unless the effect says "in addition" or similar). It will still have changeling; the effect making it all creature types will simply be overwritten.
The subtype Shapeshifter that appears on the type line is mostly there to reinforce the flavor. A creature card with changeling is just as much a Kithkin, a Goblin, a Merfolk, and a Brushwagg as it is a Shapeshifter.
Changeling is a characteristic-defining ability. It functions in all zones, not only while a card that has it is on the battlefield.
If an effect causes a creature with changeling to lose all abilities, it will remain all creature types, even though it will no longer have changeling. This is because changeling applies before the effect that removes it.