Skyship Necrocraft

Flying, Trample, Indestructible
Creatures crewing Skyship Necrocraft are
hexproof and indestructible until end of turn.
Crew 6 (Tap any number of creatures you control
with total power 6 or more: This Vehicle becomes an artifact creature until end of turn.)
Two years, 150 tonnes of steel and the population of a
large city, and you can make one of these bad boys yourself.