Artifact â Vehicle
Whenever Untethered Express attacks, put a +1/+1 counter on it.
Crew 1 (Tap any number of creatures you control with total power 1 or more: This Vehicle becomes an artifact creature until end of turn.)
You may tap more creatures than necessary to activate a crew ability.
You may activate a crew ability of a Vehicle even if itâ€™s already an artifact creature. Doing so has no effect on the Vehicle. It doesnâ€™t change its power and toughness.
When a Vehicle becomes a creature, that doesnâ€™t count as having a creature enter the battlefield. The permanent was already on the battlefield; it only changed its types. Abilities that trigger whenever a creature enters the battlefield wonâ€™t trigger.
Vehicle is an artifact type, not a creature type. A Vehicle thatâ€™s crewed wonâ€™t normally have any creature type.
Once a Vehicle becomes a creature, it behaves exactly like any other artifact creature. It canâ€™t attack unless youâ€™ve controlled it continuously since your turn began, it can block if itâ€™s untapped, it can be tapped to pay a Vehicleâ€™s crew cost, and so on.
Once a player announces that they are activating a crew ability, no player may take other actions until the ability has been paid for. Notably, players canâ€™t try to stop the ability by changing a creatureâ€™s power or by removing or tapping a creature.
If an effect causes a Vehicle to become an artifact creature with a specified power and toughness, that effect overwrites the Vehicleâ€™s printed power and toughness.
If a permanent becomes a copy of a Vehicle, the copy wonâ€™t be a creature, even if the Vehicle itâ€™s copying has become an artifact creature.
For a Vehicle to be able to attack, it must be a creature as the declare attackers step begins, so the latest you can activate its crew ability to attack with it is during the beginning of combat step. For a Vehicle to be able to block, it must be a creature as the declare blockers step begins, so the latest you can activate its crew ability to block with it is during the declare attackers step. In either case, players may take actions after the crew ability resolves but before the Vehicle has been declared as an attacking or blocking creature.
Each Vehicle is printed with a power and toughness, but itâ€™s not a creature. If it becomes a creature (most likely through its crew ability), it will have that power and toughness.
Creatures that crew a Vehicle arenâ€™t attached to it or related in any other way. Effects that affect the Vehicle, such as by destroying it or giving it a +1/+1 counter, donâ€™t affect the creatures that crewed it.
Any untapped creature you control can be tapped to pay a crew cost, even one that just came under your control.
Any +1/+1 counters on Untethered Express remain on it when it stops being a creature.