Walking Transport

Fortified land has "{t}: Add one mana of any color. If that mana is spent on a creature spell, that spell can't be countered."
Fortify {1} ({1}: Attach to target land you control. Fortify only as a sorcery.)
Crew 2 (Tap any number of creatures you control with total power 2 or more: This Vehicle becomes an artifact creature until end of turn.)