Untethered Express

Untethered Express (fr)

Artifact - Vehicle | Power/Toughness: 4 / 4 (CMC 4)
Trample
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.)